[Pidgin] #3420: PurpleChatBuddy improvements

[Pidgin]

#3420: PurpleChatBuddy improvements
-----------------------+----------------------------------------------------
 Reporter:  sadrul     |       Owner:       
     Type:  task       |      Status:  new  
 Priority:  minor      |   Milestone:  3.0.0
Component:  libpurple  |     Version:  2.2.1
 Keywords:             |     Pending:  0    
-----------------------+----------------------------------------------------
 !PurpleConvChatBuddy should have:
  - display name
  - username
  - alias

 For example, in IRC, it would be 'sadrul', 'sadrul at some-domain.here.abc'
 and NULL (or whatever alias is set) respectively. The prpls should be
 updated to send this information to purple.

 Also, the 'chat-buddy-joined', '-leaving' etc. signals should send a
 !PurpleConvChatBuddy * instead of just char *.

-- 
Ticket URL: <http://developer.pidgin.im/ticket/3420>
Pidgin <http://pidgin.im>
Pidgin