[8497] Fixes in talent 53563 work and other area auras spells.
* Support mutiply beacon buffs at same target (as will be in 3.2.x) in triggering part.
* Bonus heal caster expected original paladin, and used his heal bonuses, LoS not required for bonus heal.
* Fixed bug with not apply not-caster affected area spell (hostile area spell or talent 53563)
to another caster with same area aura active. Correctly remove only specific caster area aura at expire.
* Not show area spell icon for telent 53563 at beacon for this aura.
* Allow stacking dummy auras from diff casters, check formal aura types for effect at add aura stacking check.
Last important for area auars that can have SPELL_AURA_NONE in modifier data instead formal effect auars at caster.