Handle non PDF slide conversion for breakout rooms

Unify uploaded presentation file naming across bigbluebutton-web

Breakout rooms use current presentation - part 2

Better recording directories detection rule including breakout rooms in bbb-record

Extension preview for thumbnails on recordings

Breakout rooms use current presentation slide

Add logging for client notifications

HTML5 - Dropdown List 

record-and-playback: Forced alt to be included as part of the image thumbnail element in preview extension

Generated PDF pages are now saved under "pdfs" directory under the presentation directory instead of the "tmp" directory under "svgs" directory.

HTML5 - Setting dropdown

Made grep expression in bbb-record more strict to only detect recordings directories including breakout rooms ones.

 - record the external userid in join events.

bbb-web: Added validation to freemarker template to verify image elements are included when extension preview used

First round of accessibility fixes for 1.1

[HTML5] Fix modal opening every route transition