*Allow channeled spells to be casted on dead target

*Define relted spell attributes

--HG--
branch : trunk

src/server/game/Entities/Unit/Unit.h

@@ -1609,6 +1609,7 @@ class Unit : public WorldObject
         void RemoveAllAuras();
         void RemoveArenaAuras(bool onleave = false);
         void RemoveAllAurasOnDeath();
+        void RemoveAllAurasRequiringDeadTarget();
         void DelayOwnedAuras(uint32 spellId, uint64 caster, int32 delaytime);
 
         void _RemoveAllAuraStatMods();