UIProcessor unneeded, Stage is a processor.

Signed-off-by: Ken Hoover <ken.hoover@mail.utoronto.ca>
Changes to drawing to make testing easier.

Signed-off-by: Ken Hoover <ken.hoover@mail.utoronto.ca>
GameScreen has static reference to self now.

Just much better mileage like that, unsure of side-effects (if any).

Signed-off-by: Ken Hoover <ken.hoover@mail.utoronto.ca>