[8182] Store and use Map* pointer in WorldObject instead map ids for speedup Author: Ambal

Also some code logic cleanups.
    Changes let make more cleanups in base map access and other places,
    but this chnages not inlcuded in patch.

*This patch may cause crash.

--HG--
branch : trunk

src/game/MapInstanced.h

@@ -42,7 +42,7 @@ class TRINITY_DLL_DECL MapInstanced : public Map
         void UnloadAll();
         bool CanEnter(Player* player);
 
-        Map* GetInstance(const WorldObject* obj);
+        Map* CreateInstance(const uint32 mapId, Player * player);
         Map* FindMap(uint32 InstanceId) const { return _FindMap(InstanceId); }
         void DestroyInstance(uint32 InstanceId);
         void DestroyInstance(InstancedMaps::iterator &itr);