Spell system ports from 335

Attempting to port all major spell system updates from 3.3.5 since October. Main changes are to these systems:

SpellMods

New proc system

Immunities

..as well as dozens of commits on random parts of the spell system

My focus was purely on porting the core systems for now. I stayed away from porting any class spells/talents since many need changes for cata. I also might have ported stuff that shouldn't be on 4.3 so if you see anything like that let me know.

So basically the systems are all there, but all the DB data and SpellScripts need checking/porting.

The core compiles and boots, and the spell system basics seem to work. But need very extensive testing..