Implement QueryResult_AutoPtr type which is ACE's reference counted auto_ptr(ACE_Refcounted_Auto_Ptr) for QueryResult pointers.

Use this auto_ptr for every DB queries(except QueryNamedResult yet).

This patch guarantees NO memory leaks from QueryResult pointers.

Thanks to raczman for the idea and for the helping to make this patch.

--HG--
branch : trunk

src/game/SpellHandler.cpp

@@ -216,7 +216,7 @@ void WorldSession::HandleOpenItemOpcode(WorldPacket& recvPacket)
 
     if(pItem->HasFlag(ITEM_FIELD_FLAGS, ITEM_FLAGS_WRAPPED))// wrapped?
     {
-        QueryResult *result = CharacterDatabase.PQuery("SELECT entry, flags FROM character_gifts WHERE item_guid = '%u'", pItem->GetGUIDLow());
+        QueryResult_AutoPtr result = CharacterDatabase.PQuery("SELECT entry, flags FROM character_gifts WHERE item_guid = '%u'", pItem->GetGUIDLow());
         if (result)
         {
             Field *fields = result->Fetch();
@@ -227,7 +227,6 @@ void WorldSession::HandleOpenItemOpcode(WorldPacket& recvPacket)
             pItem->SetEntry(entry);
             pItem->SetUInt32Value(ITEM_FIELD_FLAGS, flags);
             pItem->SetState(ITEM_CHANGED, pUser);
-            delete result;
         }
         else
         {