Refactor: macro should be capitalized
Refactor video_sync() and friends

    - main thread render loop goes into X11 video driver
    - removes video_sync()
cput_thread() now has correct pthread function prototype
Refactor INTERFACE_CLASS stuff out of disk API
Refactor classic interface to run within its own thread

    * previously this classic interface acted as an oldschool modal dialog (which worked fine with the X11 renderer
      where we actively pumped the event loop)
First cut at basic OpenGLES 2.0 renderer

    * Compiles/runs on Linux
    * X11 renderer is now deprecated