Reworked chan_ooh323 channel module.

Many architectural and functional changes.
Main changes are threading model chanes (many thread in ooh323 stack
instead of one), modifications and improvements in signalling part,
additional codecs support (726, speex), t38 mode support.
This module tested and used in production environment.

(closes issue #15285)
Reported by: may213
Tested by: sles, c0w, OrNix

Review: https://reviewboard.asterisk.org/r/324/



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@227898 65c4cc65-6c06-0410-ace0-fbb531ad65f3