The Great HealingWaters Overhaul

Changes to HealingWaters:
- HealingWaters will now remove negative potion effects on the user or
the target

Changes to Methods:
- Added checks for negative potion effects, positive potion effects, and
neutral potion effects which can be used in the future by us in the
creation of abilities, or by developers utilizing the Ability API
Merge pull request #17 from Anonymous1432/master

The Great HealingWaters Overhaul