Add a new unified Jingle, Google Jingle, and Google Talk channel driver written from...

Add a new unified Jingle, Google Jingle, and Google Talk channel driver written from scratch called chan_motif.

This channel driver is a replacement for both chan_gtalk and chan_jingle but adds additional features not found in either.
These features include full configuration reload, video, full codec support, bidirectional cause code mapping, hold,
unhold, and ringing indication. It is also compliant with the current published Jingle and Google Jingle specifications.
The original Google Talk protocol is also supported for Google Voice interoperability.

You may ask yourself though where the name motif comes from... and I would say to you... music!

motif: a perceivable or salient recurring fragment or succession of notes

Sorta like a jingle!

Review: https://reviewboard.asterisk.org/r/1917/

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@369769 65c4cc65-6c06-0410-ace0-fbb531ad65f3