Mudball is spell object; Object-oriented stat fx

Status Effects (e.g. slow) are going to be objects now.
Still need to do stun and rage, but DoT and Slow are already converted.
Merge branch 'master' of https://github.com/Birdbrain2/Rougue
Merge pull request #87 from John5025/master

Object statuses, Mudball = subclass Spell