Implements shrinking of the audio RTP packet queue/jitter buffer. Refactors the functionality related to the RTP packet queue/jitter buffer further for the purposes of readability.

git-svn-id: http://svn.code.sf.net/p/fmj/code/fmj@28 799b4810-d841-4bb4-a54b-9156a0c3e4cd