Merge branch '4.3.0' into 4.4.0

# Conflicts:
#	Xamarin.Forms.Platform.Android/Xamarin.Forms.Platform.Android.csproj
#	build.cake

diff --cc Xamarin.Forms.ControlGallery.iOS/PerformanceTrackerRenderer.cs
Simple merge

diff --cc Xamarin.Forms.Platform.Android/Xamarin.Forms.Platform.Android.csproj
index fde7638,3b04d18..afe184e
--- 1/Xamarin.Forms.Platform.Android/Xamarin.Forms.Platform.Android.csproj
--- 2/Xamarin.Forms.Platform.Android/Xamarin.Forms.Platform.Android.csproj
+++ b/Xamarin.Forms.Platform.Android/Xamarin.Forms.Platform.Android.csproj
@@@ -56,7 -56,12 +56,13 @@@
      <Reference Include="System.Net.Http" />
    </ItemGroup>
    <ItemGroup>
 +    <Compile Include="Anticipator.cs" />
+     <Compile Include="..\Xamarin.Forms.Core\corefx\FormsQueue.cs">
+       <Link>corefx\FormsQueue.cs</Link>
+     </Compile>
+     <Compile Include="..\Xamarin.Forms.Core\corefx\FormsStack.cs">
+       <Link>corefx\FormsStack.cs</Link>
+     </Compile>
      <Compile Include="ActivityResultCallbackRegistry.cs" />
      <Compile Include="AndroidApplicationLifecycleState.cs" />
      <Compile Include="AndroidTitleBarVisibility.cs" />