[Coco] VCC Artifact color switch

[Robert Gault]

Luis Fernández wrote:
> Press F1
> note: but F1 is Joystick button too
>

Very good Luis! I did not imagine that anyone would prefer the keyboard over 
mouse input (the default), but it makes all the difference.

To swap artifact colors with hold F1, press F9, press F9, you must have both 
joysticks in mouse mode. Once the artifact colors are swapped, you can go back 
to keyboard mode for the joysticks.