Added support for getting modifier bits.
Merge branch 'develop' into feature/tounicodex

Conflicts:
	Headers/KLL.cpp
	Headers/KLL.h
	Sample/MainWindow.xaml.cs
	WPFKeyboard.KBD/KPDOnScreenKeyboardViewModel.cs
	WPFKeyboard.KBD/VirtualKey.cs
	WPFKeyboard/Controls/OnScreenKeyboard.cs
	WPFKeyboard/WPFKeyboard.csproj