[Pidgin] #3267: Replace PluginPref API with Request API

[Pidgin]

#3267: Replace PluginPref API with Request API
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  Reporter:  rekkanoryo  |       Owner:  sadrul
      Type:  task        |      Status:  new   
  Priority:  minor       |   Milestone:  3.0.0 
 Component:  libpurple   |     Version:  2.2.0 
Resolution:              |    Keywords:        
   Pending:  0           |  
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Comment (by sadrul):

 We can also replace !AccountOption with Request, I think.

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Ticket URL: <http://developer.pidgin.im/ticket/3267#comment:3>
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