EC's final pull request for SokobanMod 1.7.2

I have tested it (as well as I can considering what has yet to be done (worldGen and touchups/corrections-to-code))

seems to be working correctly, I have tried to mark all possible issues with a // TODO so that you can find them easily in Eclipse (I only started doing that yesterday, earlier issues might only be marked with a comment, sorry about that.)