* Disable AndroidUseLatestPlatformSdk in VS so VS stops auto-updating Android projects;
Remove XF.targets imports from projects which don't need it;
Make XF.targets imports conditional on existence of XFBT DLL in VS to avoid errors
* More consistent check for VS
* Apply nicer VS check logic to Xamarin.Forms.Xaml.UnitTests.csproj
* Fix missing "'"
* Re-add XF.targets imports to PagesGallery native projects
* Update repro to include header/footers with bound props
* [Android] Clear renderers of ListView header/footers
And don't call `RemoveAllViews`, because that causes the ObjectDisposedExceptions.
* Android AppLinks updated packages and refactor to comply with Firebase packages
* made nested classes internal
* removed notimplementedexception and added a Console log when on Failure
* removed Firebase init method. Changed Console for Android's native Exception logging
* formatted code styling with Visual Studio Community 2017 for Mac
* [Android] Update nuspec and gallery
* [Packages] Update android support packages for 25.4.0.2
Shane Neuville
Rui Marinho
E.Z. Hart
E.Z. Hart
Samantha Houts
kingces95
Jason Smith