There is only one width and height for the window.  If those are changed during the course of a fullscreen mode change, then they'll stay that size when returning to windowed mode.

There are still some problems with the ConvertNSRect() calculations when switching video modes, which causes wierd window positioning issues, and the fullscreen window is still minimized on exit.

Also added Ctrl-Enter keybinding to the test code to toggle fullscreen mode for testing.

Added an untested shader for YV12 textures

Try to create an OpenGL ES 2.0 context on Android and successfully fall back to OpenGL ES 1.1 if that fails.