fix a few bugs and make it possible to return to menu

* Change behavior to return to menu when hitting esc
* fix some bugs that occured while changing to this behavior
Merge branch 'master' of github.com:grimfang/rising_reloaded

Conflicts:
	engine/eventHandler.py
	engine/input/input.py
	engine/player/player.py
	engine/player/playerPhysics.py
	game/game.py