Remove UIWebView completely (#12095)

* Remove UIWebView completely

* - fix platform queries

Author: PureWeen

Xamarin.Forms.Core.UITests.Shared/PlatformQueries.cs

@@ -84,7 +84,7 @@ internal static class PlatformViews
 		public static readonly string Switch = "UISwitch";
 		public static readonly string TableView = "UITableView";
 		public static readonly string TimePicker = "UITextField";
-		public static readonly string WebView = "UIWebView";
+		public static readonly string WebView = "WKWebView";
 #elif __ANDROID__ || __WINDOWS__
 		public static readonly string ActivityIndicator = "android.widget.ProgressBar";
 		public static readonly string BoxView = "xamarin.forms.platform.android.BoxRenderer";

Xamarin.Forms.Platform.iOS/Renderers/WebViewRenderer.cs

@@ -108,7 +108,6 @@
     <Compile Include="$(MSBuildThisFileDirectory)Renderers\TableViewRenderer.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Renderers\TabletMasterDetailRenderer.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Renderers\TimePickerRenderer.cs" />
-    <Compile Include="$(MSBuildThisFileDirectory)Renderers\WebViewRenderer.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Properties\AssemblyInfo.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Extensions\CellExtensions.cs" />
     <Compile Include="..\Xamarin.Forms.Core\Crc64.cs">