Fix weapon get state to prevent multiple fade out
Fix boss defeat sequence, facing direction after delay
Use real falling platforms in bubble man
Load shaders once, less disk IO
Fix teleport after boss battle, int to float
Add Force class, parsing for MapLoader

Forces are used to create conveyors and other kinds of elements that
push or pull Rock in some direction.
Start work on ambientVelocity changes

This is to make Forces work with Movable objects.
Add test force to play with
Get Forces to work within Movable

By setting ambient velocity, a Movable can be moved by an external
force.