Core/Objects: merged some CreateObject2 related commits and ported some transport changes from 335 branch

src/server/game/Maps/Map.cpp

@@ -680,7 +680,9 @@ bool Map::AddToMap(T* obj)
 
     //something, such as vehicle, needs to be update immediately
     //also, trigger needs to cast spell, if not update, cannot see visual
+    obj->SetIsNewObject(true);
     obj->UpdateObjectVisibilityOnCreate();
+    obj->SetIsNewObject(false);
     return true;
 }