Implement Crackdown status, other tweaks

Surprising how painless the Crackdown implementation turned out to be!
Regarding the other changes, almost all of them are just minor visual
tweaks, except for one: I increased the damage range. Low-power attacks
like Sword Slash do about the same amount as before, but 100 Power
attacks do twice as much.  This makes Robert's Omni more of a threat
without upsetting the existing balance too much.
Implement more of Robert's strategy

Among the things implemented here: Disarray status, which randomly
changes the rank of moves; Upheaval - 80 Power Earth magic, inflicts
Disarray.  Still not happy with Robert's Phase 1 strategy though, he
wastes far too much MP in the early stages of the fight...