[Toolkit.Input] Fixed grammar errors in comments
[Toolkit.Input] Renamed WindowBinder* classes to MousePlatform - which describe better their purpose
[Toolkit.Input] Fixed comments and variables after class rename (WindowBinder -> MousePlatform)
[Toolkit.Input] Small code improvements
[Toolkit.Input] Implemented keyboard input support for desktop platforms
[Toolkit.Input] Improved initialization logic of MousePlatformWinRT - will throw exception an appropiate control was not provided
[Toolkit.Input] Implemented WinRT keyboard support
[Toolkit.Input] Changed GUIDs for SharpDX.sln MouseInput projects to be different from those in Samples solution
[Toolkit.Input] Fixed MouseInput samples for ToolkitSamples.sln
[Toolkit.Input] Fixed MouseInput samples for SharpDX.sln
[Toolkit.Input] Updated MouseInput sample project GUIDs
[Toolkit.Input]
+ added KeyboardInput samples
+ fixed modifier keys handling
Merge branch 'master' into input-kb
Merge branch 'pr/n27_ArtiomCiumac'
[Toolkit.Input] Fix issue with duplicate entries in pressed keys