Convert big_crappy_spacestation to the new model system

It's actually completely remodeled, but I used the old one as a reference so the shape and dimensions are the same.

<img src=http://i.imgur.com/n2CDusr.png />

Inside the docking bay there are 4 decal geometries, but that's disabled until the station ad system is implemented.

Not done on top of #1932, but thanks for getting the ball rolling