Continued Work: Credits Screen

* I've not got the credits scrolling on the screen.
* I also removed some code for touch screen use that won't be needed in
this game.
Got Credits Screen Up and Running

* The credits screen now exits out on its own when shortly after we have
finished rolling all the credits.
* I made some alterations to make the transition in and out of the
screen to use transparencies instead so that the Selection Screen
disappears and reappears gradually instead of suddenly.