[Pidgin] #5627: Implement custom emoticons on XMPP using XEP 0231

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#5627: Implement custom emoticons on XMPP using XEP 0231
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Reporter:  malu         |       Owner:  nwalp                
    Type:  enhancement  |      Status:  new                  
Priority:  minor        |   Component:  XMPP                 
 Version:  2.4.1        |    Keywords:  xmpp custom emoticons
 Pending:  0            |  
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 This ticket is about adding support for sending and receiving custom
 emoticons on XMPP using XEP 0231 ("Data Element") and the use-cases 3.1
 (messaging) and 3.2 (data retreival) define therein, using the libpurple
 smiley API as implemented by salinas_v and msfbrasil.

 I have starting on a patch implementing this on branch
 im.pidgin.pidgin.custom_smiley.

 The XEP also specifies other use-cases (for example for providing an image
 thumbnail in a file transfer request), but these will not be covered in
 this ticket...

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Ticket URL: <http://developer.pidgin.im/ticket/5627>
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