Escape shuttle upgrade packages

[CalliopeSoups]

As discussed in the discord, it could be neat to have some way to change which escape shuttle arrives other than admins spawning special ones. There's several ways you could do this but the thing we thought of was letting the Captain purchase upgrade packages on their PDA to let them choose a special escape shuttle. I think this would be neat not only for variety but for contributing, making new escape shuttles and possibly even putting random room type sections inside could be fun. (If the latter is even possible.)