video-provider: prioritise presenter in pagination ordering, restore pre-.22 full mesh ordering

Add individual video record control

Also restore the old full mesh, pre-.22 ordering where outbound streams were put first

video-provider: fix dynamic profile accounting when using pagination

Make external video MATCH_URL even more generic

video-provider: fix pagination edge case

If, at the time the video is shared, the user has a viewer role and
meta_hack-record-viewer-video is false this user won't have this video
stream recorded.

This adds bbb_record_video userdata that, when is set to false, signals
bbb-webrtc-sfu to avoid generating the stream recording assets for a
particular user.

By default, bbb_record_video is true.

Pulled HTML5 locales Aug 21, 2020

video-provider: first tackle at video pagination

video-provider: fix mirrorOwnWebcam behaviour (regression from #10208)

Add presentation slide text for screen readers

Notes and captions footer disabled as default

Something related on not being able to provide links

Fix shared notes and closed captions header button style

Check video data savings to set presentation max-height

Localize drop-down values for webcam quality

Remove mute and clear public chat options from breakouts

Fix text area's being created smaller than a single character

Also adds a little more visibility and well-deserved credit to Etherpad's project

On my server 2.3 alpha, the method metadata_for(meeting_id) gives back {}
(empty Hash). Thus "return if meeting_metadata.nil?" does not occur.

Does @redis.hgetall give {} instead of nil, even though there is a comment in
node_modules/redis/lib/utils.js "hgetall converts its replies to an Object. If
the reply is empty, null is returned"???

video-provider: normalize hidden cameraProfiles constraints