(RP) AFK indicators

[Zamujasa]

Basically: A way to set yourself as AFK / BRB (either/or), that pops up a tiny indicator like this. Auto-removed when you do something like move or interact. Currently, examine shows "_______ seems to be staring blankly into space", but that requires examining.

This would be more for when you have to get up for a few minutes. Not long enough to use the cryotron (15 minute delay...) but not long enough to bother finding a quiet room to hide out in. It'd also make it clear that someone isn't around even if they're still connected - useful for admins who need to go handle something, like the screenshot.

It would be totally voluntary and would not grant any sort of protection from getting beaten up/murdered/whatever; it's just to let people know you aren't around but will (ideally) be back soon.