DB/Misc: Wrathgate Stuff

Re-script Alexstrasza the Life-Binder at the Wrathgate to implement a missing event as well to play the wrathgate video which was already scripted,

This only deals with phasing at Angrathar the Wrathgate and The Court of Skulls, it does not touch the Kor'kron vanguard or Fourdragon Hold as even though have in sniff that I gain aura http://www.wowhead.com/spell=58918 in sniff in those zones and the have the ids for the fleeing horde and alliance soldiers on retail these are screaming but cant find any auras or even sound ids relating to that in sniff

Closes #10750