[?] Default keyboard setup should change. Up will be needed for other features
like going through doors and looking up, etc.
-[H] Make sure there are no invalid tile numbers in the level files
- - Tile 6 occurs in world1/level5.stl as well as other levels
[H] Worldmap needs to allow multiple maps
- or just one big map with multiple worlds?
[H] Change resolution to 800x600