Core/Scripts: Add ZoneScript hook for AreaTrigger creation/deletion

Port From (https://github.com/TrinityCore/TrinityCore/commit/1ab7050cb72544faa6a7fa17a0bf644e22538ff3)

Source/Game/Entities/AreaTrigger/AreaTrigger.cs

@@ -38,6 +38,9 @@ namespace Game.Entities
             // Register the AreaTrigger for guid lookup and for caster
             if (!IsInWorld)
             {
+                if (m_zoneScript != null)
+                    m_zoneScript.OnAreaTriggerCreate(this);
+
                 GetMap().GetObjectsStore().Add(GetGUID(), this);
                 if (_spawnId != 0)
                     GetMap().GetAreaTriggerBySpawnIdStore().Add(_spawnId, this);
@@ -51,6 +54,9 @@ namespace Game.Entities
             // Remove the AreaTrigger from the accessor and from all lists of objects in world
             if (IsInWorld)
             {
+                if (m_zoneScript != null)
+                    m_zoneScript.OnAreaTriggerRemove(this);
+
                 _isRemoved = true;
 
                 Unit caster = GetCaster();
@@ -90,6 +96,8 @@ namespace Game.Entities
                 return false;
             }
 
+            SetZoneScript();
+
             _areaTriggerTemplate = _areaTriggerCreateProperties.Template;
 
             _Create(ObjectGuid.Create(HighGuid.AreaTrigger, GetMapId(), GetTemplate() != null ? GetTemplate().Id.Id : 0, caster.GetMap().GenerateLowGuid(HighGuid.AreaTrigger)));
@@ -229,6 +237,8 @@ namespace Game.Entities
                 return false;
             }
 
+            SetZoneScript();
+
             _areaTriggerTemplate = areaTriggerTemplate;
 
             _Create(ObjectGuid.Create(HighGuid.AreaTrigger, GetMapId(), areaTriggerTemplate.Id.Id, GetMap().GenerateLowGuid(HighGuid.AreaTrigger)));