[Pidgin] #14608: Clean up Sametime

[Pidgin]

#14608: Clean up Sametime
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 Reporter:  clokep  |       Owner:  siege   
     Type:  patch   |      Status:  new     
Milestone:  2.10.1  |   Component:  Sametime
  Version:  2.9.0   |    Keywords:          
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 While re-adding Sametime support to Instantbird I made Sametime compile
 with MSVC, Florian informed me that his changes of this type were accepted
 upstream.

 This patch also adds in the Username Split that was removed at some point
 (I believe this was removed when the sametime plug-in was still part of a
 separate project on sourceforge).

 I'm not sure how applicable it is, but our bug on the issue is:
 https://bugzilla.instantbird.org/show_bug.cgi?id=102

 We have had reports that these changes work fine, although I'm not sure
 how backward compatible they are. I'm willing to put some effort into
 getting this upstream into libpurple, so let me know if things need to be
 changed.

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Ticket URL: <http://developer.pidgin.im/ticket/14608>
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