[HTML5] Adds settings service

HTML5 close #3765, Added send button aside chat textbox

[HTML] Accessibility update 02 

* upstream/master: (63 commits)
  add styles for separator
  In whiteboard text tool, a single click while editing a text sends it without creating a new text zone.
  Fixed https://github.com/bigbluebutton/bigbluebutton/issues/3777
  - escape all user passed strings
  - display length of recording in minutes instead of milliseconds
  - fix window size  - run dos2unix to remove ^M but it formatted the whole file :(
  - add dimension of screen share
  add formatted message for close chat link
  add formatted message for userlist toggle btn label
  remove unused import
  fix DropdownListSeparator to work with NVDA
  remove local storage usage and add separator
  change role from section to region
  add menu item separation NVDA fiendly
  add formatted messages and remove generic divs
  remove direct DOM manipulation
  remove span element
  add aria-label for unread messages
  add missing import to fix JoinAudio Btn
  fix lint issues
  ...

[HTML5] - Accessibility update 01

Improve user experience for whiteboard text tool

In whiteboard text tool, a single click while editing a text sends it without creating a new text zone.

Update calculation for free memory

 - escape all user passed strings

 - display length of recording in minutes instead of milliseconds

 - run dos2unix to remove ^M but it formatted the whole file :(

Merge branch 'master' of github.com:bigbluebutton/bigbluebutton into perroned-merge-webrtc-screenshare-2

* upstream/master:
  - convert "success" to upper case to match previous API. Maybe users are matching with uppercase.
  - escape image alt attribute as it's breaking xml format in some metadata.xml

 - convert "success" to upper case to match previous API. Maybe users…