spells

[Zaechus]

Implement a sensible framework for the various spells a class will have. Also needs an easy way to learn spells by level like with stat increase. Spells should fall into a few categories: inflicts damage (to 1+ enemies), heals self, temporarily boosts stats, creates some kind of object, changes state in some way (teleport to previously set room, phase to random pathway's target room, put enemies to sleep, teleport enemies away, stun enemies, etc)