Scripts/SmartAI: SetData now has an invoker (if the setting is done b…

…y something using SmartAI).

Also, some refactors.

src/server/game/AI/SmartScripts/SmartScriptMgr.cpp

@@ -462,6 +462,7 @@ SmartScriptHolder& SmartAIMgr::FindLinkedEvent(SmartAIEventList& list, uint32 li
         case SMART_EVENT_IS_BEHIND_TARGET:
         case SMART_EVENT_INSTANCE_PLAYER_ENTER:
         case SMART_EVENT_TRANSPORT_ADDCREATURE:
+        case SMART_EVENT_DATA_SET:
             return true;
         default:
             return false;