remove fmt parameter from ausrc/auplay api
ausrc/auplay api: change to 16-bit samples
update audio-driver modules with new ausrc/play API
re api changes:

- sip_param_decode() renamed to msg_param_decode()
- use msg_ctype_cmp() to check for Content-Type
stream_debug: also print local SDP address
Merge branch 'master' into ausrc_api
Merge branch 'master' into next
sndio: audio driver for OpenBSD

It was contributed by Dmitrij D. Czarkoff, thank you!
Merge branch 'master' into next
Merge pull request #5 from alfredh/next

Next
Merge branch 'master' into ausrc_api
debian: baresip now needs libre v0.4.8 or later
sndio: update to new ausrc/auplay API
dtmfio: include unistd for unlink()
Merge branch 'master' into ausrc_api
Merge pull request #6 from alfredh/ausrc_api

Ausrc api
selftest: new module for testing baresip core

the selftest module is using the public API of the
Baresip core (in baresip.h) to verify the expected
behaviour and to test various protocol scenarios.

the module can be loaded with the 'module' directive
or 'module_tmp' directive:

    module_tmp        selftest.so

OR:

    module            selftest.so
play: fix warnings when compiling with OPT_SIZE=1
use logging functions
added some missing comments