HDMI support in clockworkPI

@xor I was referring to something like the Superbook or Mirabook, which also have another USB on-board, so you only need one USB port on the GameShell to make use of both the screen, keyboard, and mouse. I intended to use this setup for developing on the GameShell, and possibly running some of the games / programs on a larger screen if desired. If you only need the screen, you can find other USB OTG screens that can accomplish this as well (e.g. from Amazon).