[Pidgin] #4509: Support XMPP Invisibility

[Pidgin]

#4509: Support XMPP Invisibility
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 Reporter:  js      |        Owner:  deryni
     Type:  defect  |       Status:  new   
Milestone:          |    Component:  XMPP  
  Version:  2.3.1   |   Resolution:        
 Keywords:          |  
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Comment(by js):

 I know privacy lists pretty well and it's not necessary to have a full
 implementation of that to have the Privacy thing in pidgin working and for
 invisibility. In fact, that'd be pretty easy. I'd even prefer that
 approach to invisible command as invisible command is experimental and not
 recommended for production use yet.

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Ticket URL: <http://developer.pidgin.im/ticket/4509#comment:12>
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