Skullrefactor

in CraftSkull.java, we implemented two hasmaps to encapsulate the id/skulltypes and byte/blockface data. We can then remove two large cases. Then, by creating a method which goes from object->id, we were able to remove the other large case towers! This significantly simplifies the data. We were unable to test the class using the built in test cases, so we tested our method on our own, and it seemed to work.