Enable skills and stats

[jdsmi]

This successfully re-enables stat and skill auto assignment during the ReturnToTown flow.

Skills are allocated by checking that the currently assigned skill points are less than the required points based on the list of skill points configured to the class.

Stats are allocated in chunks by finding the difference between the current base stats and the starting stats based on class. The original implementation used a map meaning stats had to be allocated in chunks based on stat priority. It would be nice to implement similar to skills where it "builds" stats in a list rather in chunks. The current way around this is to break up the returned stat priorities by level block.