Add a way to undo polymorph

[Noah Buttes]

Personally I think polymorph is really great right now.

It's like old shocking grasp but way more fun since you don't actually die from it.

The one thing I'm curious about is what happens if you splash strange reagent on a deceased polymorphed player. Normally strange reagent will resurrect a dead critter, but how does that work if the critter is supposed to be controlled by an actual player? Does it revive the player back into that body or does it just bring the critter back as an NPC?