Added support for file types across platforms (#26)

* Added support for file types across platforms

- Added per platform file type support, so you can specify what kind of files you want the picker to support
- Updated iOS's picker to use the non-deprecated `UIDocumentPickerViewController`
- Minor tweaks, such as package updates

* Fixed an issue with the iOS implementation, where the returned path wasn't properly formatted/absolute, which in turn meant that the path wasn't valid as is.

* A few iOS specific improvements

* Get latest changes to master (#51)

* pull master into develop before merging back (#47)

* Resolved issues with referencing from NuGet package (#29)

Simplified the nuspec file to work with wildcards and fixed macOS assembly name.
Also added development NuGet feed to readme along with some other tweaks

* Project fixes (#35)

* fixed paths to NuGet packages folder; always relative to the .sln file

* converted samples solution file to VS 2017 and fixed "Deploy" flag for Android app

* ignore Android Resource designer generated files

# Conflicts:
#	.gitignore

* changes automatically applied by VS 2017 when opening iOS project file

* Added issue template

* fixes crash in Xamarin.Forms sample when user doesn't select file; also added example code in README file (#50)

* fixed picking files from the download folder; on newer devices the document ID may not be a number, but the real filename prefixed with "raw:" (#49)

* Updated dependencies

Author: Dids

samples/Plugin.FilePicker.Sample.Forms/Droid/Plugin.FilePicker.Sample.Forms.Droid.csproj

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\packages\Xamarin.Forms.2.5.0.121934\build\netstandard1.0\Xamarin.Forms.props" Condition="Exists('..\..\packages\Xamarin.Forms.2.5.0.121934\build\netstandard1.0\Xamarin.Forms.props')" />
+  <Import Project="..\..\packages\Xamarin.Forms.3.0.0.482510\build\netstandard2.0\Xamarin.Forms.props" Condition="Exists('..\..\packages\Xamarin.Forms.3.0.0.482510\build\netstandard2.0\Xamarin.Forms.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
@@ -9,7 +9,7 @@
     <OutputType>Library</OutputType>
     <RootNamespace>Plugin.FilePicker.Sample.Forms.Droid</RootNamespace>
     <AssemblyName>Plugin.FilePicker.Sample.Forms.Droid</AssemblyName>
-    <TargetFrameworkVersion>v8.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v8.1</TargetFrameworkVersion>
     <AndroidApplication>True</AndroidApplication>
     <AndroidResgenFile>Resources\Resource.designer.cs</AndroidResgenFile>
     <AndroidResgenClass>Resource</AndroidResgenClass>
@@ -43,21 +43,6 @@
     <Reference Include="System.Xml" />
     <Reference Include="System.Core" />
     <Reference Include="Mono.Android" />
-    <Reference Include="FormsViewGroup">
-      <HintPath>..\..\packages\Xamarin.Forms.2.5.0.121934\lib\MonoAndroid10\FormsViewGroup.dll</HintPath>
-    </Reference>
-    <Reference Include="Xamarin.Forms.Core">
-      <HintPath>..\..\packages\Xamarin.Forms.2.5.0.121934\lib\MonoAndroid10\Xamarin.Forms.Core.dll</HintPath>
-    </Reference>
-    <Reference Include="Xamarin.Forms.Platform.Android">
-      <HintPath>..\..\packages\Xamarin.Forms.2.5.0.121934\lib\MonoAndroid10\Xamarin.Forms.Platform.Android.dll</HintPath>
-    </Reference>
-    <Reference Include="Xamarin.Forms.Platform">
-      <HintPath>..\..\packages\Xamarin.Forms.2.5.0.121934\lib\MonoAndroid10\Xamarin.Forms.Platform.dll</HintPath>
-    </Reference>
-    <Reference Include="Xamarin.Forms.Xaml">
-      <HintPath>..\..\packages\Xamarin.Forms.2.5.0.121934\lib\MonoAndroid10\Xamarin.Forms.Xaml.dll</HintPath>
-    </Reference>
     <Reference Include="Xamarin.Android.Support.Annotations">
       <HintPath>..\..\packages\Xamarin.Android.Support.Annotations.25.4.0.2\lib\MonoAndroid70\Xamarin.Android.Support.Annotations.dll</HintPath>
     </Reference>
@@ -106,6 +91,21 @@
     <Reference Include="Xamarin.Android.Support.v7.MediaRouter">
       <HintPath>..\..\packages\Xamarin.Android.Support.v7.MediaRouter.25.4.0.2\lib\MonoAndroid70\Xamarin.Android.Support.v7.MediaRouter.dll</HintPath>
     </Reference>
+    <Reference Include="FormsViewGroup">
+      <HintPath>..\..\packages\Xamarin.Forms.3.0.0.482510\lib\MonoAndroid10\FormsViewGroup.dll</HintPath>
+    </Reference>
+    <Reference Include="Xamarin.Forms.Core">
+      <HintPath>..\..\packages\Xamarin.Forms.3.0.0.482510\lib\MonoAndroid10\Xamarin.Forms.Core.dll</HintPath>
+    </Reference>
+    <Reference Include="Xamarin.Forms.Platform.Android">
+      <HintPath>..\..\packages\Xamarin.Forms.3.0.0.482510\lib\MonoAndroid10\Xamarin.Forms.Platform.Android.dll</HintPath>
+    </Reference>
+    <Reference Include="Xamarin.Forms.Platform">
+      <HintPath>..\..\packages\Xamarin.Forms.3.0.0.482510\lib\MonoAndroid10\Xamarin.Forms.Platform.dll</HintPath>
+    </Reference>
+    <Reference Include="Xamarin.Forms.Xaml">
+      <HintPath>..\..\packages\Xamarin.Forms.3.0.0.482510\lib\MonoAndroid10\Xamarin.Forms.Xaml.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Plugin.FilePicker.Sample.Forms\Plugin.FilePicker.Sample.Forms.csproj">
@@ -138,20 +138,21 @@
     <AndroidResource Include="Resources\drawable-xxhdpi\icon.png" />
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
-  <Import Project="..\..\packages\Xamarin.Forms.2.5.0.121934\build\netstandard1.0\Xamarin.Forms.targets" Condition="Exists('..\..\packages\Xamarin.Forms.2.5.0.121934\build\netstandard1.0\Xamarin.Forms.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.Compat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Compat.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.Compat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Compat.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.Core.UI.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Core.UI.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.Core.UI.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Core.UI.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.Core.Utils.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Core.Utils.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.Core.Utils.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Core.Utils.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.Media.Compat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Media.Compat.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.Media.Compat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Media.Compat.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.Fragment.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Fragment.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.Fragment.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Fragment.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.Transition.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Transition.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.Transition.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Transition.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.v4.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v4.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.v4.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v4.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.v7.CardView.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.CardView.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.v7.CardView.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.CardView.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.v7.Palette.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.Palette.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.v7.Palette.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.Palette.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.v7.RecyclerView.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.RecyclerView.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.v7.RecyclerView.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.RecyclerView.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.Vector.Drawable.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Vector.Drawable.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.Vector.Drawable.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Vector.Drawable.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.Animated.Vector.Drawable.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Animated.Vector.Drawable.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.Animated.Vector.Drawable.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Animated.Vector.Drawable.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.v7.AppCompat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.AppCompat.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.v7.AppCompat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.AppCompat.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.Design.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Design.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.Design.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Design.targets')" />
-  <Import Project="..\..\packages\Xamarin.Android.Support.v7.MediaRouter.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.MediaRouter.targets" Condition="Exists('..\..\packages\Xamarin.Android.Support.v7.MediaRouter.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.MediaRouter.targets')" />
+  <Import Project="..\packages\Xamarin.Forms.2.5.0.121934\build\netstandard1.0\Xamarin.Forms.targets" Condition="Exists('..\packages\Xamarin.Forms.2.5.0.121934\build\netstandard1.0\Xamarin.Forms.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.Compat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Compat.targets" Condition="Exists('..\packages\Xamarin.Android.Support.Compat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Compat.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.Core.UI.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Core.UI.targets" Condition="Exists('..\packages\Xamarin.Android.Support.Core.UI.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Core.UI.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.Core.Utils.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Core.Utils.targets" Condition="Exists('..\packages\Xamarin.Android.Support.Core.Utils.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Core.Utils.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.Media.Compat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Media.Compat.targets" Condition="Exists('..\packages\Xamarin.Android.Support.Media.Compat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Media.Compat.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.Fragment.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Fragment.targets" Condition="Exists('..\packages\Xamarin.Android.Support.Fragment.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Fragment.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.Transition.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Transition.targets" Condition="Exists('..\packages\Xamarin.Android.Support.Transition.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Transition.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.v4.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v4.targets" Condition="Exists('..\packages\Xamarin.Android.Support.v4.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v4.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.v7.CardView.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.CardView.targets" Condition="Exists('..\packages\Xamarin.Android.Support.v7.CardView.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.CardView.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.v7.Palette.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.Palette.targets" Condition="Exists('..\packages\Xamarin.Android.Support.v7.Palette.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.Palette.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.v7.RecyclerView.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.RecyclerView.targets" Condition="Exists('..\packages\Xamarin.Android.Support.v7.RecyclerView.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.RecyclerView.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.Vector.Drawable.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Vector.Drawable.targets" Condition="Exists('..\packages\Xamarin.Android.Support.Vector.Drawable.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Vector.Drawable.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.Animated.Vector.Drawable.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Animated.Vector.Drawable.targets" Condition="Exists('..\packages\Xamarin.Android.Support.Animated.Vector.Drawable.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Animated.Vector.Drawable.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.v7.AppCompat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.AppCompat.targets" Condition="Exists('..\packages\Xamarin.Android.Support.v7.AppCompat.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.AppCompat.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.Design.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Design.targets" Condition="Exists('..\packages\Xamarin.Android.Support.Design.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.Design.targets')" />
+  <Import Project="..\packages\Xamarin.Android.Support.v7.MediaRouter.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.MediaRouter.targets" Condition="Exists('..\packages\Xamarin.Android.Support.v7.MediaRouter.25.4.0.2\build\MonoAndroid70\Xamarin.Android.Support.v7.MediaRouter.targets')" />
+  <Import Project="..\..\packages\Xamarin.Forms.3.0.0.482510\build\netstandard2.0\Xamarin.Forms.targets" Condition="Exists('..\..\packages\Xamarin.Forms.3.0.0.482510\build\netstandard2.0\Xamarin.Forms.targets')" />
 </Project>