FS-7830: mod_opus: added use-dtx param in config file (enables DTX on the encoder, announces in fmtp)

* commit 'c797e948':
  FS-7824 Add functionality for capturing screenshots from both legs to uuid_write_png

With this patch, uuid_write_png is able to capture screenshots from both
legs of a bridged video call. It still expects a uuid and filename for
the first two arguments. If given a third argument, it must be concat
or split. If concat is specified, screenshots from both ends are taken
and written side by side to the given filename. If one image is shorter
than the other then it is padded with black and vertically centered. If
the third argument is split then the two screenshots are written to
separate files. In this case, a second filename is expected as a fourth
argument.

FS-7820 updated switch_event.c to have benchmark framework, and updated .gitignore file to ignore binary test files

 and docs

Merge pull request #319 in FS/freeswitch from ~LAZEDO/freeswitch:feature/aditional_sofia_events to master

* commit '58043483':
  FS-7773 [mod_sofia] transfer events #resolve

C level unit testing and micro benchmarking framework, including one
example unit test.

Merge pull request #341 in FS/freeswitch from ~DRAGOS_OANCEA/freeswitch-dragos:opus-keep-fec-on-improve to master

* commit '244331aa':
  FS-7819: mod_opus: restore bitrate after increase (if there's no more packet loss) , added step for 60 ms

FS-7819: mod_opus: restore bitrate after increase (if there's no more packet loss) , added step for 60 ms

* commit 'f767fe5e':
  Fixed Bug/FS-7754

Merge pull request #287 in FS/freeswitch from ~ARTURZ/freeswitch:FS-7405-condition-regex-all-proper-fix to master

* commit '9d6ad1f9':
  FS-7405 Fix <condition regex="all"> to work with time conditions

* commit '4dc7b3b2':
  FS-7760 #resolve

added xml fetch for channels to externally support nightmare transfer
depends on channel-xml-fetch-on-nightmare-transfer profile param (default is disabled)

fixes missing entry in switch_xml.c to enable the xml binding

Merge pull request #277 in FS/freeswitch from ~ARTURZ/freeswitch:FS-7639-audio-sent-as-dtmf to master

* commit '8b1ce0f1':
  FS-7639 Fix rtp_session->recv_te and rtp_session->cng_pt comparisions in switch_rtp.c

* commit '48b44832':
  FS-7198 add coma separated values and reverse ranges for time-of-day and day-of-week matches

Merge pull request #338 in FS/freeswitch from ~DRAGOS_OANCEA/freeswitch-dragos:opus-ptime-60ms-support to master

* commit '76bdd2b0':
  FS-7809: mod_opus: added 60 ms ptime for Opus at 8 khz  ( opus@8000h@60i )

* commit 'be6e6ea5':
  FS-7801: mod_opus: added support to set CBR mode

* commit '410850fa':
  FS-7685 fix Dutch numbers pronunciation

The Dutch number pronunciation is more like the German one. 21 is
pronounced as "one-and-twenty".

FS-7685 #resolve

* commit '66a2ba22':
  FS-7648 Fix regex "all" and "xor" tests.

* commit '57a76001':
  FS-7200, fix dialplan parsing when using date/time matches

* commit '31ade5f9':
  FS-7799 Add API command uuid_write_png to mod_png

This adds the API command uuid_write_png to mod_png which takes a uuid and
file as input. This command takes a screenshot from the session associated
with the given uuid and writes it to the given file. If an absolute path
is not specified, the images directory is used as a prefix.

* commit '521b3037':
  change event header 'call-direction' to 'presence-call-direction'

* commit 'b17564e8':
  FS-7705: mod_shout - dependency declaration added to SPEC file.

* commit '97394bd6':
  FS-7778 Fix ALTER TABLE statement to use single quotes.

Merge pull request #311 in FS/freeswitch from ~LAZEDO/freeswitch:feature/sms_delivery_report to master

* commit '05c476f9':
  FS-7764 #resolve

* commit 'eaf6430e':
  FS-7776 #resolve add mod_kazoo to build system

Merge pull request #331 in FS/freeswitch from ~CRIENZO/freeswitch:fs-7780-add-max-session-transfers to master

* commit '05cc8bb3':
  FS-7780 add new channel variable max_session_transfers.  If set, this variable is used to count the number of session transfers allowed instead of the max_forwards variable.  If not set, the existing behavior is preserved.