Remove mining/asteroid secret rooms and replace them with asteroid specific vaults

Created by: Probe1

It's how tg does it and honestly it's a much better system. It's more modular, it's easier to add new content, and the mining secret rooms are ancient and outdated.

I don't even know how they work.

@unid15 are you game on copying and pasting a bunch of stuff for us to get a template and the ball rolling?