Shadow Updates

Shadow Priest r6.
- Merged the Cleave and Normal Shadow Priest profile.
- Fixed Shadow Priest boss dotting button to only appear for
Priest-class.
- Refactored the entire Shadow Priest profile
- Added better initial and on-pull support for multi-orb starts. This
should prevent the profile from going nuts when you start off with 2 or
more Shadow Orbs and result in higher initial burst and sustained DPS

Other:
- Removed the empty placeholder Destruction profile.