AbiathRPC - Debugging level creation

I noticed today that though creating levels in AbiathRPC worked, trying to edit the new ones in the instance that created them would cause a crash. The old level wrapper (one around the plain GalaxyLevel) was still held in the current tool. Even after I made ScanForLevelSetChanges refresh the current tool when necessary, the watchdog render planes were still holding onto the wrong wrapper. There isn't a convenient way to make sure they always have the right kind, so AbiathRPC now keeps a table of plain level instances and tagged ones, updating it when a new level is created and consulting it when looking for a given level wrapper's level ID. Editing new levels now works.