In mod_conference 1.6.x, all conference users could get the audio floor
regardless of the kind of video layer they were placed in.

In 1.8.x, the concept of a 'dedicated video layer' was introduced, such that
video layout slots with a reservation ID or a role ID are marked with the
'MFLAG_DED_VID_LAYER' member flag when a member is in the slot, and such
marked layers are prevented from becoming the conference audio/video floor
holder.

This makes sense for the video floor in all circumstances, and the audio floor
in most circumstances.

However, there are some circumstances where allowing users in these dedicated
video layers to become the conference audio floor holder is preferred, such as
when all slots in the layout have reservation IDs, and the audio floor events
are used to manage users in those slots manually.

This adds a conference profile flag, 'ded-vid-layer-audio-floor, which, when
enabled, allows conference members in dedicated video layers to become the
conference audio floor holder.

Merge pull request #1509 in FS/freeswitch from ~THEHUNMONKGROUP/freeswitch:feature/FS-11117-allow-passing-float-values-to-font_scale to master

* commit 'fecb5d36':
  FS-11117: font_scale float values, add min/max_font_size when setting video banner

Merge pull request #1355 in FS/freeswitch from ~THEHUNMONKGROUP/freeswitch:feature/FS-10554-add-conference-api-command-vid-res-id-force to master

* commit 'cc084c9f':
  FS-10554: Refactor conference vid-res-id command, add 'force' option

The 'conference vid-res-id' sub command previously used the CONF_API_SUB_MEMBER_TARGET
command parsing strategy. The standard options exposed by that strategy didn't make
sense for this sub command, so it's now been switched to use the CONF_API_SUB_ARGS_SPLIT
command parsing strategy.

A third, optional 'force' argument has also been added. The default behavior of the
command is to toggle the user in and out of a reservation slot, use the force argument
to ensure the user is placed into the reservation slot provided.

The new signature of the sub command is:

  vid-res-id <member_id> <val>|clear [force]

Previously, the font_scale parameter available for the video_mute_banner/video_banner_text
conference channel variable would only accept integer values. It now can accept float
values for more fine grained control, eg:

  <action
    application="set"
    data="video_banner_text={font_scale=.75}Banner Text"
  />

Add params to set min_font_size and max_font_size for video banners.

The hard-coded defaults of 5/24 for min/max font size don't always look good
depending on the layout use case. This adds min_font_size and max_font_size
params for more fine-grained control, eg:

  <action
    application="set"
    data="video_banner_text={min_font_size=8,max_font_size=14}Banner Text"
  />

Merge pull request #1539 in FS/freeswitch from ~ANDYWOLK/freeswitch:bugfix/FS-11189-windows-build-regression to master

* commit '5c4211e4':
  FS-11189: [Build-System] Windows build regression fix.

Merge pull request #1538 in FS/freeswitch from ~ANDYWOLK/freeswitch:bugfix/FS-11189-add-video-settings to master

* commit '2323421b':
  FS-11189: [Build-System] Fix Windows build.

load time:
first load config default settings
merge any settings in XML

run time:
merge any dynamic settings

FS-11226: [freeswitch-core,mod_conference] Missing font files can lead to crash in conference #resolve

FS-11211: [Verto-Communicator] Add turnServer and verto server fallback options -- FS side to only do relay as a last resort #resolve

Check value of sanity while looping over
switch_cache_db_get_db_handle_dsn() in switch_user_sql_thread.