Updated GameWindow and its implementations to use GraphicsFormat instead of the obsolete DisplayMode.
Updated license.
Updated some docs.
Fixed CLSCopmliant warnings in XRamExtension.cs
the [...]GLNative classes now use GLContext instead of the platform-specific [...]GLContext implementations.
Updated the IGLContext interface with functions to query the current context.
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.