Reworks the Build Your Own Shuttle Kit to be more appealing. (#44433)

About The Pull Request

This makes it so the BYOS starts with some construction materials, is a bit smaller to be less of a hideously huge project to work on, and is pressurized so more people can help with it.

Price has been increase to -2500 from -7500.
Why It's Good For The Game

I often see the BYOS barely built, and even then usually only by one person who actually has a space suit. This often leaves it completely unprepared by the time the shuttle is actually called. This PR attempts to rectify that.

Changelog

cl WJohnston
tweak: Build Your Own Shuttle kit has been made smaller, comes with construction materials, and is pressurized.
balance: Lowered value from -7500 to -2500. It still doesn't come with a brig or console, so you cannot greentext antags or launch early.
/cl