Reworked activity to add seen
The activity monitoring routines were pulled out to reduce duplication.
Activity logging now tracks for 6 months.
coolkids was modified to remove entries older than 10 minutes.
Datastore was modified to track activity data.
Moved computationally expensive prune to the hourly maintenance.
Added support for <nick>, prefix syntax
Removed culling no longer necessary for activity
Removed undelimited nick from prefix list
Turns out people talk about gummy in regular chat and it makes him behave funny.