On part
From Botnix
on_part
Called every time a user parts, before their user structures are modifed to reflect the change.
Parameters:
- $self - Module name
- $nid - Network name where this event occured (case sensitive)
- $server - Servername of user
- $nick - User's nickname
- $ident - User's ident (username)
- $host - User's hostname
- $channel - Channel where the event occured
- $reason - Part reason or undef

