Added a mmt file for 3D bouncing. (And a python File to call the Scroll). And changed the 2d bouncing scroll to only use stepUntil instead of stepUntilX

Added the 2D wall Bouncing Scroll (WBouncingScroll) and a new StepUntil Function that also takes constant values

clean up

Added commetns to show which facts are required and which facts are aquired.

removed old comments and cleaned up code