added dtmfio module
fixed some spacing
Spelling fix
dtmfio: fix whitespace and ccheck.py warnings
dtmfio: fix warnings and improve detection
portaudio: fix clang warnings
ua: prefix contact-user cookie with SIP username
added call_setup_duration() and some small things

- Thanks to Lorenzo Mangani for this work
config: add opensles to template
Merge branch 'master' into next