Update level editor so that it is now possible to add levels to a world, add bg/mp3 to a level, delete levels, delete bg/mp3. All paths in the XML are relative to that file. When working in code, all paths are absolute
* Quick and dirty: removed the flicker from animation. (for demo)

* Added directions to Character class.
* Added AnimatedSprites for left and right animations in Game class.
* Added bad guy counter to Level Editor.

* Added bad guy counter to Level class.