Set "reason" on existing ban entry if a kick matching usermask is detected

[koobs]

eir currently messages the user who sets a ban on a channel requesting:

Please comment on the following: ban[XXXXX] <mask> was set on <#channel> by <user> on <date> and had an expiry date of <datestamp>.

It would be great if eir waited an $appropriate amount of time after a ban was set (say 30 seconds or so) prior to requesting a ban reason be set.

eir should use this time to wait for, look for, or detect a kick in the same channel as the ban was set in, who's kicked user hostmask also matches the previous set ban hostmask.

If this condition is met, eir should set the existing ban entry reason to the kick reason if it is set. If no reason is set, eir should do what it normally does, message the user that set the ban.

This saves manual effort / duplication / accidental entry mangling