[Pidgin] #13739: XML events support and instant update of other users avatars

[Pidgin]

#13739: XML events support and instant update of other users avatars
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 Reporter:  tomkiewicz     |     Owner:  bartosz
     Type:  enhancement    |    Status:  new    
Component:  Gadu-Gadu      |   Version:  2.7.11 
 Keywords:  events avatar  |  
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 Recently I found out a small issue: if another user changes it's avatar,
 we don't get it updated. New avatar is visible after our reconnect, or
 after this other user status change.

 I found out, that we get these updates in XML event packet, but we don't
 handle them. XML events can contain:
  - GGLive messages (I think, it's something like tweeter service)
  - notifications about avatar changes
  - notifications about user's new blog entries
  - graphical statuses (I hope we will NOT support this one)

 I have implemented general support for XML events, so we could provide
 support for new GaduGadu features in the future. Also, I have fixed that
 small issue, by implementing avatar change notifications, provided by
 these events.

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Ticket URL: <http://developer.pidgin.im/ticket/13739>
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