[Tracker] [Pidgin] #21: Rename UI functions into the pidgin_* namespace

[Pidgin]

#21: Rename UI functions into the pidgin_* namespace
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 Reporter:  rlaager       |       Owner:                             
     Type:  defect        |      Status:  new                        
 Priority:  blocker       |   Milestone:  Go public with Pidgin 2.0.0
Component:  pidgin (gtk)  |     Version:  2.0                        
 Keywords:                |  
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Ticket URL: <http://developer.pidgin.im/ticket/21>
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