[Pidgin] #12647: Implement a set of UI ops/signals for the dnssrv.[ch] API

[Pidgin]

#12647: Implement a set of UI ops/signals for the dnssrv.[ch] API
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 Reporter:  Robby                   |        Owner:  darkrain42
     Type:  defect                  |       Status:  new       
Milestone:  Patches Needing Review  |    Component:  XMPP      
  Version:  2.7.3                   |   Resolution:            
 Keywords:                          |  
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Comment(by xnyhps):

 darkrain pointed out that TXT lookups are used in Adium for Jabber, so
 need ui ops too. Updated the patch to allow the same functions to be used
 for TXT queries too.

 Additionally, I have renamed some functions and datatypes to show which
 are SRV only, which TXT only, and which are used by both.

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Ticket URL: <http://developer.pidgin.im/ticket/12647#comment:3>
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