Rewrote showdown set exporting to be much clearer, added auto-fixing of
relearn moves when importing showdown set (applies suggested relearn
moves)
Simplified main form loading routine (from ~160 to ~25 by extracting
methods)
Closes#1236
pk4/bk4 only, obviously
side note, using static events is no-no, designer auto-removed them.
just manually reapply (as well to others that used it)