Restore thin windows

[Grayshift]

You can't make thin windows anymore - the option was removed with the advent of Cogmap2. I suspect this was done because they aren't done in the isometric perspective, although there are still a few places they're used on station (and the plasma glass windows here and there). Removing features for aesthetic reasons seems kinda dumb, so I would like them back, for making hallway mazes if nothing else.