Shadow Updates

Shadow Priest:
- Removed the ability to dot up Totems and Banners with the profile.
This should be especially helpfull in Arenas, Unrated/Rated BG's and
General Nazgrim.

- Updated Thok's coding. Instant cast spells should now be cast
regardless if he's casting "Deafening Screech" or not. Spells with a
casting time will still be interrupted, as he's casting but not while
affected by a Paladin's "Devotion Aura".