Scripts/HoO: Templeguardian Anhuur Changes

*Temple Guardian Anhuurs Devine Reckoning will now target a random target instead of his victim
*Also his heroic version of Devine Reckoning will now heal Anhuur
*Reverberating Hymn will now get interrupted when Anhuur takes any damage when the shield of light is gone
*simplyfied the shield counter and damage check
*Implement the achievement 'I hate that Song'.

*possible todo: spell attribe usable_while_stunned may be required also for channeled spells to make the reverberating hymn work properly
@Subv void DamageTaken(Unit* /*attacker*/, uint32& damage) override  is the hook im talking about. it doesnt matter if i use me->HealthBelowPctDamaged(66, damage) or (me->HealthBelowPct(66) because both will have the same result with the difference that HealthBelowPct(66) wont trigger stuff if i kill anhuur instantly for example. if you take a look at your current ahnuur anddamage him with overkill damage, you will see that his shield phase triggers  (light rays to the pillars and yelling his text).