Resolving Conflict.
Fixing WINGL build.
Fixing WINRT build.
Fix for Android's Mouse.GetState().
Merge branch 'develop' into MultiWindowMouseInput

Conflicts:
	MonoGame.Framework/Windows/WinFormsGameWindow.cs
Merge pull request #1749 from SickheadGames/MultiWindowMouseInput

Multi-Window Mouse Input
Fixed crash when secondary GameWindow doesn't handle KeyState.
Merge pull request #1824 from SickheadGames/keyfix2

Fixed GameWindow Crash
Merge remote-tracking branch 'upstream/develop' into develop