Add a (discord) Bot Command to check ghost roles

[Carver]

Per title.

I can check the crew manifest via !smanifest to see how many people are on there, but if I see 6 people on the Horizon and there are potentially upwards of 14 on Konyang then I may be misled into assuming the pop is near dead. So I propose either adding a new !s command to check the ghost role manifest, or throwing them into the main command in some form. I hold no particular preference.