if dead, end screen sharing.

Merge branch 'master' of github.com:bigbluebutton/bigbluebutton into start-pause-stop-screen-sharing-with-webrtc

Merge branch 'screenshare-1.1' of https://github.com/antobinary/bigbluebutton into antobinary-screenshare-1.1

Conflicts:
	bbb-screenshare/app/src/main/scala/org/bigbluebutton/app/screenshare/ScreenShareApplication.scala
	bbb-screenshare/app/src/main/scala/org/bigbluebutton/app/screenshare/server/sessions/Screenshare.scala
	bigbluebutton-client/src/org/bigbluebutton/modules/screenshare/services/MessageReceiver.as

Change operation order when switching slides. Fix #3277

* master:
  Archive more logs with zip option and show more applications with status using "bbb-conf"
  When is user is logged out from the breakout room conference the window is closed.
  RoomActionsRenderer listenBtn style is correctly updated when the leaves audio conference then joins it again.
  Don't appy recording marks twice to audio
  RnP: Use correct directory when loading captions.json
  Minor playback.js cleanups
  Various updates to the rnp edl handling
  Make shape rendering in presentation recordings closer to live BBB
  hide the randomAssign button (temporarily)
  server side changes for switching recordType:String to record:Boolean
  breakout rooms:change record to checkbox + boolean
  Ensure invalid CC messages aren't sent to the server after owner change
  bbb-web: Set defaultMaxUsers=0 in bigbluebutton.properties
  RnP: Generate blank video when the recording has captions

Close browser window in breakout rooms logout

Ensure invalid CC messages aren't sent to the server after owner change

Updated zip and status option for bbb-conf to handle 1.1-dev applications

RoomActionsRenderer listenBtn style is correctly updated

RoomActionsRenderer listenBtn style is correctly updated when the leaves audio conference then joins it again.

Recording cleanups

RnP: Use correct directory when loading captions.json

Use a function that handles parameters correctly when updating the
timestamp in the url for links, fix indentation in caption loading code.
Treat exceptions when checking for url existence as errors.

bbb-web: Set defaultMaxUsers=0 in bigbluebutton.properties

RnP: Generate blank video when the recording has captions

Server side changes for switching recordType:String to record:Boolean

Main change is to rewrite the start/stop event handling to do fewer
passes and use simpler logic (it no longer has to track durations).

The temporary work audio codec is switched to flac; slightly lower hard
drive use and it avoids the 4-hour length limit of wav.

Some improvements to the video seeking when processing deskshare and
webcam videos, to avoid video dropouts.

Tweaks to the audio encoding quality settings.

Remove an unused function.

Breakout rooms: hide the randomly Assign button (temporarily)