Converted screen mode code to mostly ctypes; no longer depends on PyObjC 2.3
Converted screen mode code to mostly ctypes; no longer depends on PyObjC 2.3

niklaskorz/pyglet,adamlwgriffiths/Pyglet,niklaskorz/pyglet,adamlwgriffiths/Pyglet,adamlwgriffiths/Pyglet,niklaskorz/pyglet,adamlwgriffiths/Pyglet,niklaskorz/pyglet