Add new module to manage passive auras from class or item effects.

Add new module to manage passive auras from class or item effects.

Manage the Readiness (cooldown reduction) passive, hidden buff from the
Siege of Ogrimmar trinkets that grants cooldown reduction based on role.

Add corresponding buffs to "ovale_items" script that match the SimC names
fo the same buffs and can be used to track whether the buff is active:

    cooldown_reduction_agility_buff
    cooldown_reduction_strength_buff
    cooldown_reduction_tank_buff

Add a new SpellInfo() parameter "buff_cdr=ID" that lists the spell ID of
the cooldown reduction buff that affects that spell.  Annotate spells
whose cooldowns are affected by the trinkets.

git-svn-id: svn://svn.curseforge.net/wow/ovale/mainline/trunk@1477 d5049fe3-3747-40f7-a4b5-f36d6801af5f