FS-9612 #resolve [RTCP-MUX wrongly enabled in cases where answer contains rtcp but offer didn't / remote addr not obtained in UDPTL mode] %backport=1.6

FS-9609 - [mod_callcenter] BLF for Queues, callcenter_track app, EXIT_WITH_KEY reason and xml_curl improvements

This change implements a few new features, there's no behavior change at all.

1 - BLF for queues

You can now use BLF for knowing when there are callers waiting on a queue,
the pattern to be subscribed is callcenter+queuename@default or @domain name.

2 - callcenter_track app

Now every agent has an external_calls_count column that will be read upon
selecting agent to offer new calls.
If you start an external call (inbound or outbound) and don't wan't
mod_callcenter to offer new calls for this agent just call this app
passing the agent name as argument:

<action application="callcenter_track" data="agent1"/>

This will increment the external calls count, and to make mod_callcenter look to this variable you need to set this queue parameter:

<param name="skip-agents-with-external-calls" value="true"/>

3 - EXIT_WITH_KEY reason

If the member press a key to exit the queue the cc_cancel_reason will be this now.

4 - xml_curl config loading improvements

Prior to this mod_callcenter query your web server a LOT of times,
this will make it only query once per queue, just watch for CC-Queue
request param and build your xml with everything related to that queue,
including tiers (tiers wasn't loaded before this).

FS-9608 [verto_communicator] [verto] Passing audio params directly to audio object and updating goog settings

Merge pull request #989 in FS/freeswitch from ~DRAGOS_OANCEA/freeswitch-dragos:opus-improve-adjustable-bitrate to master

* commit 'f47bbece':
  FS-9601: mod_opus:  make adjustable bitrate mutually exclusive with FEC enforcing on the decreasing trend, add step calculation for bitrate adjustment, fix bug on context settings

Merge pull request #990 in FS/freeswitch from ~PIOTRGREGOR/freeswitch:bugfix/FS-9598-fail-session-creation-if-not-enough to master

* commit '184368d8':
  FS-9568 [avmd] Fail session creation if can't be started properly
  FS-9596 #resolve [rtp-timeout triggered for on-hold calls with a=inactive]
  FS-9597 #resolve [host_lookup does not resolve v6 addrs] %backport=1.6

Merge pull request #988 in FS/freeswitch from ~PIOTRGREGOR/freeswitch:feature/FS-9595-add-number-of-sessions-currently to master

* commit 'b24c2ac9':
  FS-9595 [avmd] Extend avmd show api

FS-9601: mod_opus:  make adjustable bitrate mutually exclusive with FEC enforcing on the decreasing trend,
add step calculation for bitrate adjustment, fix bug on context settings

Add number of sessions currently running to output of avmd show api.

* commit '293f2fda':
  FS-9584 Separate initial bitrate negotiation from sample rates

Merge pull request #973 in FS/freeswitch from ~PIOTRGREGOR/freeswitch:feature/FS-9564-add-lagged-detectors to master

* commit 'b44b6e5b':
  FS-9564 [avmd]: add lagged detectors

Merge pull request #972 in FS/freeswitch from ~PIOTRGREGOR/freeswitch:feature/FS-9542-process-audio-samples-in-threads to master

* commit '8e189ed2':
  FS-9542 [avmd]: multithreaded

Addition of detectors which skip first few frames
of audio before they start to process it helps
to properly handle some Verizon voicemails.
The result of avmd test using this commit is
OK. All PASS [100]

Thi scommit also resolves:
FS-9588 Add script for outbound avmdy
FS-9589 Add resolution info to events

Merge pull request #986 in FS/freeswitch from ~WALDYR/freeswitch:FS-9591-Adjust-settings-and-fix-preview-bugs-to-improve-user-experience to master

* commit '0ccf74e2':
  FS-9591 [verto_communicator] Adjust settings and fix preview bugs to improve user experience

Merge pull request #984 in FS/freeswitch from ~WALDYR/freeswitch:FS-8076-Ask-before-closing-page-if-call-in-progress to master

* commit 'ecf5a0ce':
  FS-8076 [verto_communicator] Ask before closing the page if a call is in progress.

Merge pull request #981 in FS/freeswitch from ~WALDYR/freeswitch:FS-8958-no-controls-for-moderator-on-secondary-canvas to master

* commit 'baba2acd':
  FS-8958 [verto_communicator] Fix no layout controls for moderator on secondary canvas

Merge pull request #982 in FS/freeswitch from ~WALDYR/freeswitch:FS-8976-alert-that-the-login-has-failed to master

* commit 'b6057f10':
  FS-8976 [verto_communicator] Properly alert that the login has failed vs silently failing and sitting there.

FS-8976 [verto_communicator] Properly alert that the login has failed vs silently failing and sitting there.