Made small passages passable. Changed some stats.

All physical squares and circles are slightly smaller now. Changed IceTile stats
a bit. Changed Sten's density.
Doors added but are bugged. Cleaned up view.

It is possible to enter new rooms, but the game hangs when re-entering an old
one. Need ViewState for doors (should be as simple as obstacles).
Claned up view: animation should not be in java2d, Direction moved to view.