[Pidgin] #3419: Use PurpleConvMessage with conversation signals

[Pidgin]

#3419: Use PurpleConvMessage with conversation signals
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 Reporter:  sadrul     |       Owner:       
     Type:  task       |      Status:  new  
 Priority:  minor      |   Milestone:  3.0.0
Component:  libpurple  |     Version:  2.2.1
 Keywords:             |     Pending:  0    
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 The sending-, sent-, receiving-, received-, writing-, wrote- family of
 signals should use !PurpleConvMessage.

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Ticket URL: <http://developer.pidgin.im/ticket/3419>
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