Refactors cargo to reside in the codebase

[nauticall]

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NOTE TO SYSADMINS: This PR makes the Cargo SQL file(s) stored online redundant. They should be removed.

Moves the data containing cargo items (i.e. the ones you order from ops and get in the cargo shuttle) from the online database to the codebase. Everything from suppliers to categories to individual items is now code-side and editable by developers/contributors.

Refactors cargo items to use singletons instead of datums for cargo_supplier, cargo_category, and cargo_item. Multiple-instnace things like cargo_orders, etc. still use datums.

Fixed a bunch of strange discrepancies in categories, suppliers, and pricing for various cargo items. I did a little bit, but it's exhausting to go through all of it right now.

Clicking the 'Details' button on the Cargo Order app now actually gives you details instead of bluescreening. Also added some UI elements to the Cargo Order app - Cargo Control and Delivery remain untouched.

Overhauled the Cargo Order console TGUI window. It now has tabs on the left, displays restricted access, supplier information, and boasts search functionality.

This PR has a lot of moving parts, and would probably be best suited for a testmerge to iron out any possible hiccups.