Core/Misc: Implement AreaTrigger entity

(might need some cleanup)

src/server/game/Entities/Object/Object.cpp

@@ -64,6 +64,7 @@ uint32 GuidHigh2TypeId(uint32 guid_hi)
         case HIGHGUID_GAMEOBJECT:   return TYPEID_GAMEOBJECT;
         case HIGHGUID_DYNAMICOBJECT:return TYPEID_DYNAMICOBJECT;
         case HIGHGUID_CORPSE:       return TYPEID_CORPSE;
+        case HIGHGUID_AREATRIGGER:  return TYPEID_AREATRIGGER;
         case HIGHGUID_MO_TRANSPORT: return TYPEID_GAMEOBJECT;
         case HIGHGUID_VEHICLE:      return TYPEID_UNIT;
     }
@@ -197,6 +198,7 @@ void Object::BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target) c
         case HIGHGUID_PET:
         case HIGHGUID_CORPSE:
         case HIGHGUID_DYNAMICOBJECT:
+        case HIGHGUID_AREATRIGGER:
             updateType = UPDATETYPE_CREATE_OBJECT2;
             break;
         case HIGHGUID_UNIT:
@@ -1046,6 +1048,9 @@ uint32 Object::GetUpdateFieldData(Player const* target, uint32*& flags) const
             if (ToCorpse()->GetOwnerGUID() == target->GetGUID())
                 visibleFlag |= UF_FLAG_OWNER;
             break;
+        case TYPEID_AREATRIGGER:
+            flags = AreaTriggerUpdateFieldFlags;
+            break;
         case TYPEID_OBJECT:
             break;
     }