Remove unnecessary packages.config files (#654)

The `packages.config` files included in the `FormsGallery.iOS`,
`ShapesDemos.Android`, and `Xaminals.iOS` projects were unused and have
been removed.  TodoWCF had a combination of `<PackageReference/>`
elements and a `packages.config` file which has now been removed to
simplify the project.

Author: pjcollins

FormsGallery/FormsGallery/FormsGallery.iOS/packages.config

@@ -1,7 +1,5 @@
 <?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.4.8.0.1269\build\Xamarin.Forms.props" Condition="Exists('..\packages\Xamarin.Forms.4.8.0.1269\build\Xamarin.Forms.props')" />
-  <Import Project="..\packages\Xamarin.Forms.4.7.0.3125\build\Xamarin.Forms.props" Condition="Exists('..\packages\Xamarin.Forms.4.7.0.3125\build\Xamarin.Forms.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>

UserInterface/ShapesDemos/ShapesDemos.Android/ShapesDemos.Android.csproj

@@ -95,7 +95,6 @@
     <None Include="Entitlements.plist" />
     <None Include="Info.plist" />
     <Compile Include="Properties\AssemblyInfo.cs" />
-    <None Include="packages.config" />
   </ItemGroup>
   <ItemGroup>
     <InterfaceDefinition Include="Resources\LaunchScreen.storyboard" />

UserInterface/ShapesDemos/ShapesDemos.Android/packages.config

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\packages\Xamarin.Forms.4.8.0.1269\build\Xamarin.Forms.props" Condition="Exists('..\packages\Xamarin.Forms.4.8.0.1269\build\Xamarin.Forms.props')" />
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
     <MinimumVisualStudioVersion>10.0</MinimumVisualStudioVersion>
@@ -35,6 +34,9 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="4.8.0.1269" />
+  </ItemGroup>
   <ItemGroup>
     <!-- A reference to the entire .NET Framework is automatically included -->
     <EmbeddedResource Include="Views\TodoItemPage.xaml">
@@ -83,7 +85,6 @@
     <None Include="Connected Services\TodoWCFService\TodoWCF.TodoWCFService.TodoItem.datasource">
       <DependentUpon>Reference.svcmap</DependentUpon>
     </None>
-    <None Include="packages.config" />
     <None Include="Properties\ServiceReferences.Designer.ClientConfig" />
   </ItemGroup>
   <ItemGroup>
@@ -104,24 +105,5 @@
       <LastGenOutput>Reference.cs</LastGenOutput>
     </None>
   </ItemGroup>
-  <ItemGroup>
-    <Reference Include="Xamarin.Forms.Core, Version=2.0.0.0, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\packages\Xamarin.Forms.4.8.0.1269\lib\netstandard1.0\Xamarin.Forms.Core.dll</HintPath>
-    </Reference>
-    <Reference Include="Xamarin.Forms.Platform, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\packages\Xamarin.Forms.4.8.0.1269\lib\netstandard1.0\Xamarin.Forms.Platform.dll</HintPath>
-    </Reference>
-    <Reference Include="Xamarin.Forms.Xaml, Version=2.0.0.0, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\packages\Xamarin.Forms.4.8.0.1269\lib\netstandard1.0\Xamarin.Forms.Xaml.dll</HintPath>
-    </Reference>
-  </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\packages\Xamarin.Forms.4.8.0.1269\build\Xamarin.Forms.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Xamarin.Forms.4.8.0.1269\build\Xamarin.Forms.props'))" />
-    <Error Condition="!Exists('..\packages\Xamarin.Forms.4.8.0.1269\build\Xamarin.Forms.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Xamarin.Forms.4.8.0.1269\build\Xamarin.Forms.targets'))" />
-  </Target>
-  <Import Project="..\packages\Xamarin.Forms.4.8.0.1269\build\Xamarin.Forms.targets" Condition="Exists('..\packages\Xamarin.Forms.4.8.0.1269\build\Xamarin.Forms.targets')" />
 </Project>