X11 and Windows GLControl and GLNative implementation now use IGLContext interfaces instead of direct X11GLContext and WinGLContext. Decouples the two (good!).
Updated all Native, Control, Context classes to use the new interfaces.
Updated everything to not use raw window handles, but rather WindowInfo objects.
Added code that (hopefully) creates an invisible input window for X11.
WinRawInput now correctly subclasses WinGLNative or WinGLControl. WinRawKeyboard now correctly responds to events.
Removed T10_GLSL_Cube.cs which was erroneously moved outside the Examples/Tutorial directory.
Updated INativeWindow, IGameWindow and IGLControl interfaces.
Updated examples to use the new GameWindow interface.
Added documentation to GameWindow.
Improved GameWindow error handling. More defensive programming.