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 properly
no. i used this there because the snakes doesnt respawn properly at their home position if the players kite them arround the room. (old old bug which appears if the corpse doesnt despawn before respawn)