Stella 3.3 for Playstation 3

This is a light port of stella using the sdcell library. Only changes necessary for the PS3 were made to the source.
The interface is still a little rough around the edges.

Inputs:
	Press R3 to toggle between 'soft mouse' and joystick mode.
	In soft mouse mode, use the left stick to move the cursor, Cross to left click, and Square to Right click.
	In joystick mode the gamepad acts as a standard SDL Joystick, with the exception that the L3 and R3 buttons are unavailable for use.
	In soft mouse mode press L3 to toggle the on screen keyboard. As of this writing the osk in barely functional. While their state is tracked, the modifier keys have no effect on input.
	USB keyboards and mice are supported. But are not thoroughly tested.
