[Feature request] OpenGL support

[raichu]

The lengthy code looks like it was auto-generated, so I first looked for the generating code to add QGLWidget there somehow, but it wasn't there (is it handwritten??).

I hope you could add bindings for QGLWidget and improve the support for QImage and QPixmap. This would expand the functionality of this bindings immensely, and make it possible for people write games, emulators in go using your bindings :)