presentation conversion threads. If the presentation takes a lot of time and cpu to convert,
   other uploaded presentations gets queued up and cannot be processed in parallel.

Fixed unclosed video windows bug

Updated text for logout message:

Changes to the chat audio cue control

Added more checks in bbb-conf --check

Fix syntax error in bbb-conf

Made bbb-conf --enablewebrtc aware of SSL configuration

Reduce WebRTC reconnect attempts

HTML5 client: move to ES6.

Added check for displaying 443 ssl port when doing bbb-conf --check

Merge branch 'reconnect-fixes' of https://github.com/pedrobmarin/bigbluebutton into pedrobmarin-reconnect-fixes

Started using ES2015 inheritance for the whiteboard models instead of the auxiliary function created by the transpiler.

WebRTC reconnect

Conflicts:
	bigbluebutton-client/resources/prod/lib/bbb_webrtc_bridge_sip.js
	bigbluebutton-client/src/org/bigbluebutton/main/model/users/AutoReconnect.as
	bigbluebutton-client/src/org/bigbluebutton/modules/phone/managers/WebRTCCallManager.as

Fixes for issues #2898, #2788, #2789

Added check to restart libreoffice if no users are logged in

Made bbb-conf more resilient to commented parameters