Core/GameObject: implemented gameobject_overrides table to change faction and flags values on a per-spawn basis

Port From (https://github.com/TrinityCore/TrinityCore/commit/67a1a1d29b76acfcda505fe1a38761a335e93bc5)

Source/Game/Entities/GameObject/GameObjectData.cs

@@ -1356,13 +1356,17 @@ namespace Game.Entities
         #endregion
     }
 
-    public class GameObjectTemplateAddon
+    // From `gameobject_template_addon`, `gameobject_overrides`
+    public class GameObjectOverride
     {
-        public uint entry;
-        public uint faction;
-        public uint flags;
-        public uint mingold;
-        public uint maxgold;
+        public uint Faction;
+        public GameObjectFlags Flags;
+    }
+
+    public class GameObjectTemplateAddon : GameObjectOverride
+    {
+        public uint Mingold;
+        public uint Maxgold;
         public uint WorldEffectID;
         public uint AIAnimKitID;
     }