feat(Core/SAI): implement new removeObjectFromWorld param for SMART_A… (#19275)

feat(Core/SAI): implement new removeObjectFromWorld param for SMART_ACTION_FORCE_DESPAWN

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

@@ -1271,22 +1271,29 @@ void SmartScript::ProcessAction(SmartScriptHolder& e, Unit* unit, uint32 var0, u
         case SMART_ACTION_FORCE_DESPAWN:
         {
             for (WorldObject* target : targets)
+            {
+                if (e.action.forceDespawn.removeObjectFromWorld)
+                {
+                    if (e.action.forceDespawn.delay || e.action.forceDespawn.forceRespawnTimer)
+                        LOG_ERROR("sql.sql", "SmartScript: SMART_ACTION_FORCE_DESPAWN has removeObjectFromWorld set. delay and forceRespawnTimer ignored.");
+
+                    if (Creature* creature = target->ToCreature())
+                        creature->AddObjectToRemoveList();
+                    else if (GameObject* go = target->ToGameObject())
+                        go->AddObjectToRemoveList();
+                }
+                else
                 {
                     Milliseconds despawnDelay(e.action.forceDespawn.delay);
 
                     // Wait at least one world update tick before despawn, so it doesn't break linked actions.
                     if (despawnDelay <= 0ms)
-                {
                         despawnDelay = 1ms;
-                }
 
                     Seconds forceRespawnTimer(e.action.forceDespawn.forceRespawnTimer);
                     if (Creature* creature = target->ToCreature())
-                {
                         creature->DespawnOrUnsummon(despawnDelay, forceRespawnTimer);
-                }
                     else if (GameObject* go = target->ToGameObject())
-                {
                         go->DespawnOrUnsummon(despawnDelay, forceRespawnTimer);
                 }
             }

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

@@ -978,6 +978,7 @@ struct SmartAction
         {
             uint32 delay;
             uint32 forceRespawnTimer;
+            SAIBool removeObjectFromWorld;
         } forceDespawn;
 
         struct