Core/Spells: Implemented SPELL_EFFECT_CANCEL_CONVERSATION

Port From (https://github.com/TrinityCore/TrinityCore/commit/1673b6e2ff69b9a59522892280e91cc5085a5ec0)

Source/Game/Entities/Conversation.cs

@@ -80,7 +80,7 @@ namespace Game.Entities
             base.Update(diff);
         }
 
-        void Remove()
+        public void Remove()
         {
             if (IsInWorld)
             {

Source/Game/Maps/GridNotifiers.cs

@@ -1341,6 +1341,7 @@ namespace Game.Maps
         WorldObject _searcher;
         ICheck<WorldObject> i_check;
     }
+
     public class WorldObjectListSearcher : Notifier
     {
         public WorldObjectListSearcher(WorldObject searcher, List<WorldObject> objects, ICheck<WorldObject> check, GridMapTypeMask mapTypeMask = GridMapTypeMask.All)
@@ -2642,6 +2643,23 @@ namespace Game.Maps
         ObjectGuid _casterGUID;
     }
 
+    class ObjectEntryAndPrivateOwnerIfExistsCheck : ICheck<WorldObject>
+    {
+        ObjectGuid _ownerGUID;
+        uint _entry;
+
+        public ObjectEntryAndPrivateOwnerIfExistsCheck(ObjectGuid ownerGUID, uint entry)
+        {
+            _ownerGUID = ownerGUID;
+            _entry = entry;
+        }
+
+        public bool Invoke(WorldObject obj)
+        {
+            return obj.GetEntry() == _entry && (!obj.IsPrivateObject() || obj.GetPrivateObjectOwner() == _ownerGUID);
+        }
+    }
+    
     class GameObjectFocusCheck : ICheck<GameObject>
     {
         public GameObjectFocusCheck(WorldObject caster, uint focusId)

Source/Game/Spells/SpellEffects.cs

@@ -5336,6 +5336,28 @@ namespace Game.Spells
             Conversation.CreateConversation((uint)effectInfo.MiscValue, unitCaster, destTarget.GetPosition(), ObjectGuid.Empty, GetSpellInfo());
         }
 
+        [SpellEffectHandler(SpellEffectName.CancelConversation)]
+        void EffectCancelConversation()
+        {
+            if (effectHandleMode != SpellEffectHandleMode.HitTarget)
+                return;
+
+            if (!unitTarget)
+                return;
+
+            List<WorldObject> objs = new();
+            ObjectEntryAndPrivateOwnerIfExistsCheck check = new(unitTarget.GetGUID(), (uint)effectInfo.MiscValue);
+            WorldObjectListSearcher checker = new(unitTarget, objs, check, GridMapTypeMask.Conversation);
+            Cell.VisitGridObjects(unitTarget, checker, 100.0f);
+
+            foreach (WorldObject obj in objs)
+            {
+                Conversation convo = obj.ToConversation();
+                if (convo != null)
+                    convo.Remove();
+            }
+        }
+
         [SpellEffectHandler(SpellEffectName.AddGarrisonFollower)]
         void EffectAddGarrisonFollower()
         {