[8102] Simplify code base at new root method WorldObject::CleanupsBeforeDelete Author: VladimirMangos

* Call it from Map::AddObjectToRemoveList and remove now not needed explcit calls
    * Create Gameobject version to make GO with owner more safe for remove

--HG--
branch : trunk

src/game/Object.h

@@ -498,6 +498,8 @@ class TRINITY_DLL_SPEC WorldObject : public Object
         bool HasInArc( const float arcangle, const WorldObject* obj ) const;
         bool IsInBetween(const WorldObject *obj1, const WorldObject *obj2, float size = 0) const;
 
+        virtual void CleanupsBeforeDelete();                // used in destructor or explicitly before mass creature delete to remove cross-references to already deleted units
+
         virtual void SendMessageToSet(WorldPacket *data, bool self);
         virtual void SendMessageToSetInRange(WorldPacket *data, float dist, bool self);