======Synopsis:======
[[on]] [<modes>]public [<serial#>] [-|^]<match> { <action> }

======Description:======
This hook is triggered whenever a regular public message is sent to the
client's current channel by someone else also on the channel.

======Parameters:======
|$0     |nickname sending message     |
|$1     |channel sent to              |
|$2-    |text of message              |