[Pidgin] #15532: Enable Spontaneous Listing in pidgin

[Pidgin]

#15532: Enable Spontaneous Listing in pidgin
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 Reporter:  cyisfor  |      Owner:  elb
     Type:  patch    |     Status:  new
Milestone:  3.0.0    |  Component:  IRC
  Version:           |   Keywords:  list automation
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 Some IRC networks sometimes send lists (321, 322, 323) that were not
 explicitly and only requested by the LIST command. For instance in
 darkmyst, when you send a search query to a specialized bot, it responds
 with notices, and the server responds with a list. I noticed this list was
 being silently discarded (if (!irc->account) return) and thought that it'd
 be better if the channel list dialog popped up to show whatever channel
 list the server was sending.

 Technically darkmyst should set it so you send "LIST searchquery" instead
 of "PRIVMSG RPGServ :searchquery" but I think pidgin can play nice with
 this odd behavior. I've attached the patch I made, which Works For Me.
 Changes the semantics of the /list command, of the IRC plugin's list
 preparer protocol function, and of the responses to messages 321, 322 and
 323. Nothing outside the irc plugin, thankfully.

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Ticket URL: <https://developer.pidgin.im/ticket/15532>
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