Fix issue: Meeting doesn't end when last user leaves

 - the client to server rtt message is always updating the meeting activity. This prevents the meeting
   from ending due to inactivity.

Fix webhooks

Revert "Make it so that cameras use the full space of the video window"

[HTML5] delay the notfication that the echo test is connected

Track sip conn ids

 - we still need to remove the connection from the global audio list but not send the global audio left event
   to akka-apps

   user from the voice conference

Delay removing user when leaving

   are in the old users list or they are new ones. Need to remove users not on the new user's list
   as they might have left during auto-reconnects.

save user mapping to memory db before trying to save on redis to avoid inconsistency on the next event

Pulled html5 locales oct 24, 2018

Update sip.js

Fix #6167

Update bbbResources.properties

Update quotes

Merge branch 'v2.0.x-release' of github.com:bigbluebutton/bigbluebutton into delay-removing-user-when-leaving

Fix Flash reconnect attempts

Stop HTML5 ejecting from voice on reconnect and fix voice user creation

Temporary fix until we update the calculation of the pool size

[Flash] disable the webrtc audio stats

 - check to make sure user is not kicked out of voice conference even…

   flash client auto-reconnects.

Fix for bug in preview not working for students

Fix breakout rooms buttons visibility for moderators

Fix PR #6122