REMAKE OF PREVIOUS COMMIT: Added the Coin Press into Cargo Bay.

This is a remake of the Coin Press commit, as I nuked my previous fork to fix things.

The coin press was re-added into Cargo Bay, and was split into a computer and a machine. The machine handles making the actual coins, the computer handling the GUI.

The minted coins are now used to export for supply points, requiring 5 coins per point.

You can also export other materials, such as subspace parts, and circuit-boards, and mecha parts, if Cargo Bay doesn't turn all the materials into coins for export.