Allows customizing the banner displayed when video is muted, via conference
param 'video-mute-banner' per conference, or channel var 'video_mute_banner'
per user.

Foreground/background colors, font face/size, and text can all be customized.

FS-9342 - [verto_communicator] Properly saving settings to localStorage when closing the settings panel.

This reverts commit cf610796.

* commit 'cf610796':
  Fix for FS-9313

Merge pull request #886 in FS/freeswitch from ~MGROOMS/freeswitch-matthew:bugfix/detect_audio_silence to master

* commit '6c3710df':
  FS-9264: Introduce two new api calls named detect_audio and detect_audio_silence. The existing wait_for_silence call never actually waits for silence until it first detects non-silence. There is also no way to set an independent timeout for detecting both the non-silence and then silence. This causes problems when wait_for_silence is called on an already quiet channel. Splitting the function up into two separate calls with separate timeouts offers more flexibility.

Merge pull request #909 in FS/freeswitch from ~PIOTRGREGOR/freeswitch:bugfix/FS-9009-windows-warning to master

* commit 'd49b66c9':
  FS-9009 [mod_avmd] #fix warning on Windows

Initialize variance of amplitude - avoid (incorrect) warning

Merge pull request #908 in FS/freeswitch from ~PIOTRGREGOR/freeswitch:bugfix/FS-9009-fix-windows-build to master

* commit '6d614ac1':
  FS-9009 [mod_avmd] #fix build on Windows

Windows VC doesn't accept function __attribute__(s)

Merge pull request #900 in FS/freeswitch from feature/FS-9310-native-support-for-flowroute-sms to master

* commit '35b816bb':
  FS-9310 Native support for Flowroute SMS API over HTTP(S)

* commit 'f6192c79':
  FS-9241: follow-up patch to fix a mistake in fetching profile url

* commit '78c2ed05':
  FS-9241 Use tls_public_url instead of tls_url in INVITE Contact when NAT is detected

Merge pull request #904 in FS/freeswitch from ~PIOTRGREGOR/freeswitch:feature/FS-9009-avmd-amplitude-estimation to master

* commit 'a7738745':
  FS-9009 [mod_avmd] Amplitude estimation

Add DESA-2 estimation of signal amplitude

* commit '9988d8d9':
  FS-9278: sending sendonly instead of sendrecv media attribute in SDP when unholding call when Zoiper softphone had responded with inactive

FS-9278: sending sendonly instead of sendrecv media attribute in SDP when unholding call when Zoiper softphone had responded with inactive

FS-9314: [mod_conference]  fix crash when starting conference in mux mode while specifying or defaulting to a layout group that does not exist.  We will now fall back to transcode mode in this case.

FS-9307: [mod_conference] don't close files until after video threads are done to avoid race condition trying to use closed file handle when playing a video file

FS-9305: [mod_conference] return the logo image path from video-logo-img api and handle passing no image path

FS-9303 these checks are no longer needed as the video flag is not sent to file open unless we are in transcode mode, you can record mp4 but it will only contain the audio if in passthru mode.