AFK system

[ElementalMP4]

A system which any member may use to notify other people if they are AFK.
Members will use the AFK command to set an optional reason for being AFK.
If the member is mentioned, barista will notify the mentioner that this person (or people if there are multiple) is AFK.
As soon as the AFK member sends a message, they will no longer be AFK.

A command and routine should be used, command will set the status and the routine will check for mentions and messages from the AFK member.