Worked on scenes. Still buggy.
Some trials
Refactored scenes, removed .lvl xml-loading stuff.
Added more meaningful splash screen, removed old one.
Forgot to remove stars stuff from ResourcesManager.
Tried some stuff. The cave and portal should be defined in TMX map and created in TmxLevelLoader.
Implemented GameEndScene.
Fixed game end scene bugs.
Refactored classes. Removed levels, since we don't have them anymore.
Merged branch dave into master.