+ finished addition of stone throw. closes #15
+ balanced enemy knockback when hit by stone. closes #16
+ fixed bug: deleted lights are also deleted in global list of lights ($lightsOnMap)
+ FIXED bug: doors now open when killing an enemy. closes #17
+ added Map functionality. closes #7
+ moved Interface Sprites to an own Scene in an own SceneWindow. This causes some bugs. Most of them has been fixed. refs #18