Change how talents are handled to use new TRB.Classes.Talents and TRB.Classes.Talent classes. Move as much logic out of TRB.Functions.Talent as possible, leaving (probably, for now) just ArePvpTalentsActive() there.

Core

• Add Talents and Talent classes with generic functions
• Remove references to the obsolete TRB.Functions.Talent functions

Demon Hunter

Havoc

• Main/overarching

Druid

Balance

• Main/overarching

Feral

• Main/overarching

Restoration

• Main/overarching

Evoker

Devastation

• Main/overarching

Preservation

• Main/overarching

Augmentation

• Main/overarching

Hunter

Beast Mastery

• Main/overarching

Marksmanship

• Main/overarching

Survival

• Main/overarching

Monk

Mistweaver

• Main/overarching

Windwalker

• Main/overarching

Priest

Discipline

• Discipline main/overarching

Holy

• Holy main/overarching

Shadow

• Shadow main/overarching

Rogue

Assassination

• Main/overarching

Outlaw

• Main/overarching

Shaman

Elemental

• Main/overarching

Enhancement

• Main/overarching

Restoration

• Main/overarching

Warrior

Arms

• Main/overarching

Fury

• Main/overarching