* [Commands] Cleanup #nukebuffs Command.
- Cleanup messages and logic.
- #nukebuffs now allows you to nuke all, beneficial, or detrimental buffs, also added a help menu.
- Add BuffFadeBeneficial().
- Cleanup logic in some buff fade methods.
- Fix several spots where we were using CalcBonuses() when it was unnecessary, i.e when you fade no buffs you do not need to recalculate bonuses.
* Update spells.cpp