Loading times for map catalog and course replays improved!

Building of map/competitions catalog at start of the game was taking longer than it would be nice in last few months. And waiting while course replays wasn't too nice too with increased amount of player replays. So it was just right time for massive optimization. Everything is now parallelized. Time needed for map catalog building or for downloading replays were improved by whole magnitude. Map catalog will be most often be built till you will enter course list. Other changes: Removed colliders for streamed rocks in Landvetter maps. As it was annoying to avoid them. Please let me know if you will experience some issues. Like loading of replays will get stuck forever or too long etc.