Initial commit for ticket #950: QoS support:
 - implementation:
     - PJLIB (sock_qos*.*)
 - added QoS support in:
     - SIP UDP transport, 
     - SIP TCP transport,
     - media UDP transport (done in pjsua-lib), 
     - pjnath ICE stream transport,
     - pjnath STUN socket,
     - pjnath TURN client
 - added QoS options in pjsua-lib:
     - QoS fields in pjsua_transport_config
 - added "--set-qos" parameter in pjsua

Notes:
 - QoS in TLS transport is not yet implemented, waiting for #957
 - build ok on VS6, VS2005 (multiple targets), Carbide, and Mingw
 - no run-time testing yet



git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@2966 74dad513-b988-da41-8d7b-12977e46ad98
29 files changed