[MERGED PR] Makes Stowaway a latejoin role

[mintyphresh]

I can definitely see how spawning with hacking tools can be problematic, but the whole "spawning in maint with hacking tools" was already possible with taking Stowaway and picking engineer. Stowaways kind of need some way to sneak around the station; if their roundstart involves pounding on a maint door until they get let out then that kind of ruins the whole schtick.

A bootleg ID is a reasonable suggestion, though, and definitely something I'd implement if the hacking tools route ended up not working out.