Removed Object2D files, added IEntity, Entity and REntity.
Modified build method, so that files of the compile list, that don't exist are shown.
Major code refactor around what was previously Object2D and now is Entity. A new, more complex but more robust architecture is now place.
Removed a lot of unneeded files and classes.
Particle system is temporary disabled, it needs to be adapted to the new architecture.
Updated file compile list.