[Pidgin] #16834: Add programatic codec configuration to Media API

[Pidgin]

#16834: Add programatic codec configuration to Media API
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 Reporter:  salinasv     |      Owner:  Maiku
     Type:  enhancement  |     Status:  new
Milestone:  3.0.0        |  Component:  Voice and Video
  Version:  3.0.0hg      |   Keywords:  gstreamer codec farstream media
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 (on behalf of haakon from SIPE)

 Right now we configure the GStreamer codecs with a harcoded "#define"
 configuration that we write to a file so Farstream/Gstreamer pick it up.

 We want to add an API to modify this codec configuration so prpls and
 plugins can modify it as needed by their usecase.

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Ticket URL: <https://developer.pidgin.im/ticket/16834>
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