FS-11837: [Core] Add feature to allow execution of an app on audio change, execute_on_audio_change variable.

FS-11642: [core] add audio and video versions of the variables set for the rtp_retain_crypto_keys feature

to be consistant with Content-Type at the end of headers if present
dynamically alloc memory to avoid buffer overflow on large message

A request with no body MUST NOT include a Content-Type or any other
MIME-specific header fields.  A request without a body MUST contain
an end-line after the final header field.  No extra CRLF will be
present between the header section and the end-line.

FS-11805 [mod_sofia] set default session timeout for outbound calls before overriding it with NAT detection.

FS-11807 [mod_commands] uuid_recv_dtmf changed to report OK when well formed request is consumed by dmachine or dtmf hook

This reverts commit 53dbe5d8.

This previous patch made logger function not reentrant so reverting until we can get a fix without that issue