Renames writeRTCPFeedbackMessage() -> writeControlPayload() in various places (RTPTranslatorImpl, RTPConnectorImpl, ...)

Adds sources of libmkv and change the way libvpx is build to reflect changes, when using debian source packet.

https://github.com/jitsi/libjitsi/pull/11#issuecomment-49404492
Also fix a bug where the first frame only was send (when loopFile was true) :

FFmpeg doesn't set the number of frame contained in the IVF file, so
the IVFFileReader was reading only the first frame because it thought
it has reached the last frame. It now use the EOF to know if the end
is reached or not.

in the IVF file to sync the stream, instead of just
using the framerate of the frame.

frames for the doRead function...

Also add a custom MediaDevice for convenience.

Updates fmj to the latest and greatest version that allows to override the default RTCP report creation algorithm and that includes an RTCP packet parser