[Pidgin] #7732: Updated XMPP User Avatar support

[Pidgin]

#7732: Updated XMPP User Avatar support
----------------------------------+-----------------------------------------
 Reporter:  darkrain42            |     Owner:  deryni
     Type:  patch                 |    Status:  new   
Component:  XMPP                  |   Version:  2.5.2 
 Keywords:  jabber, xmpp, avatar  |  
----------------------------------+-----------------------------------------
 The current version of [http://xmpp.org/extensions/xep-0084.html XEP-0084]
 has two changes from the current implementation of User Avatar support in
 libpurple's XMPP prpl.

   * Namespaces changed (ugh...)
   * Changed semantic for specifying no icon

 I'm attaching two patches. The first patch lets libpurple accept either a
 <stop/> element or an empty <metadata/> element indicate that the contact
 has no avatar.

 The second patch extends libpurple to support the new namespace. I
 apologize for the narstiness of the code (it's not that it's bad code, it
 just feels unnecessary). libpurple will publish a changed avatar to both
 the old- and new-style PEP nodes (for backwards compatibility with the
 current generation of clients that don't support the new namespace), will
 advertise support for both, and will accept updates from contacts using
 either set of namespaces.

-- 
Ticket URL: <http://developer.pidgin.im/ticket/7732>
Pidgin <http://pidgin.im>
Pidgin