Fixed Region's internals
Tested RegionPager, removed trace statements, fixed logic errors
Merge branch 'master' into stable

Even though some parts of the new map system are a stub, I feel confident
enough to merge this branch back onto the stable branch.

On the whole, I've reduced the complexity of the system, while also allowing
acceptable restrictions.

The RegionPager class works correctly. The Update() member is empty, but it's
still usable.

I've removed TileSheetManager, so the maps can only have one tileset each;
that's fine.

The tiles are voxel integers.

The editor needs an entire overhaul. I think some of the GUI components
are too complex. The sooner I can implement the map in the main
client/server system the better.