Jitsi: activate record audio

https://community.jitsi.org/t/local-recording/14638
https://github.com/jitsi/jitsi-meet/pull/3223
https://github.com/ztl8702/jitsi-meet/issues
https://blog.radiumz.org/en/article/loc ... jitsi-meet

To enable this feature add these lines to config.js:

localRecording: {
  enabled: true,
  format: ‘flac’  // can replace with ‘wav’, ‘ogg’
}

Key 'L' shows gui to start and stop recording. Only operator can do this. (Make sure to have only one active operator online. Else can happen undefined cases.) After stopping recording saving is immediatly starting into default download folder.