listen only: remove the old silent audio autoplay workaround (#11115)

audio: make sdpSemantics configurable

  [screenshare] Rewrite SFU/Kurento screensharing bridge (+reconnections|audio sharing|QoL, was #11025)

The underlying webkit autoplay issues were properly tackled a long time ago now; this thing isnt needed anymore

Also took the liberty to remove the whole create listen only stream thing because it`s useless

Plan B is going to be phased out of Chrome soon and we should be testing it with unified plan

Added detectio for /etc/bigbluebutton/bbb-web.properties

I must have messed this up in the 2.2 - 2.3 merge or with vim somehow, mea culpa

Adapted the breakout room screen sharing shutdown to use the new refactor calls

Also changed the behaviour a bit to only trigger the stop code for presenters/sharers, mimicking the camera behaviour and not leaving viewer with stuck screens

 video-provider: add video pagination UI toggle (was #10970)

Fix captions and guest list openPanel error

Fix poll response text typo

Merge branch 'u22-screenshare18102020' of https://github.com/prlanzarin/bigbluebutton-1 into u23-ilgiardino

Fix locales url settings + captions locales order

don't prompt for "Microphone" if that's the only option presented to the user

Recording processing using MP4/OGG temporary files, stream copy, and …

Submit typed polling response by pressing enter

video-provider: add inbound/recvonly video reconnection (was #11233)

re-implement chat sync and fix stucked loading indicator

User logged out ValidateAuthToken retracted  

* moving locales folder to /public and applying changes needed to serve locales as static files

* better dev/prod check

* transifex pull script changes to match new locales directory + ignore locales with less than 100 lines

* fix local/prod locales path

* merge fallback messages

* applies new locale changes to legacy client

`bbb-html5.nginx` file content should also be changed to the following:

```
location /html5client/locales {
  alias /usr/share/meteor/bundle/programs/web.browser/app/locales;
}

location /html5client/compatibility {
  alias /usr/share/meteor/bundle/programs/web.browser/app/compatibility;
}

location /html5client/resources {
  alias /usr/share/meteor/bundle/programs/web.browser/app/resources;
}

location /html5client/svgs {
  alias /usr/share/meteor/bundle/programs/web.browser/app/svgs;
}

location /html5client/fonts {
  alias /usr/share/meteor/bundle/programs/web.browser/app/fonts;
}

location /html5client {
  # proxy_pass http://127.0.0.1:4100; # use for development
  proxy_pass http://poolhtml5servers; # use for production
  proxy_http_version 1.1;
  proxy_set_header Upgrade $http_upgrade;
  proxy_set_header Connection "Upgrade";
}
```

Editing poll options via drag and drop

Fixes presentation invisible box appearing if presentation is hidden

This is a workaround that shaves off some edge cases around wrongfully done camera reconnections and outbound cameras getting stuck in the UI even though they arent being shared anymore

Problem: setReconnectionTimeout was being called in the first candidate generation to set the negotiation/reconnection timeout up. That caused some browsers or specific scenarios (mainly envs without STUN) to establish the negotiation (playStart) before generating any useful out-of-band candidates (relay). That would cause the timeout to be set AFTER it is supposed to be cleared due to success (playStart), making the webcam drop after a while

So I moved the setReconnectionTimeout call to a safer spot: right after the first negotiation requisition goes out to bbb-webrtc-sfu