Add some font files
Add debug toggle button and title fps
Add a get method for retrieving a copy of the entities array
Add font rendering for debugging purposes
Modify the graphic and solid debug methods
Add Collision detection for solids and slopes

Adds two new classes, one abstract movable entity and one platformer
entity.
Remove TestWorld

Committed it by accident, its sole purpose is for testing, not part of
the game engine.
ignore TestWorld.java