Asteroid and vanilla inventory!

Asteroid gen now works, but I'll have to tweak it later (allow compass
to work?) and Keets will have to fix the inventory.
Asteroid Improvements

-Temporarily made of station glass
-Spawns "outcast sheds"
-Need to make them gen after terrain
-Need to add roof
-Larger asteroid
-Smaller asteroids at outskirts
-Cooler terrain
minor asteroid gen changes
Merge remote-tracking branch 'origin/Pdan-NewStuff' into parakeet-repairs
Enabled inventory.