- end the meeting asap when the last user leaves by setting meetingExpireWhenLastUserLeftInMinutes=0 in
   bbb-web's bigbluebutton.properties

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

Revert "Update API to display if the user is sharing his screen and what screen-sharing type he is using."

This reverts commit 72d7e17f.

 - fix screenshare redis connection error
 - fix bbb-web create meeting exception when second user joins

Add new parameter `userInactivityThresholdInMinutes` to bigbluebutton.properties and improve inactive user warning and eject from server.

Refactor user inactivity messages naming to have two distinct names: `UserInactivityInspectMsg` and `UserActivitySignResponseMsg`.

Move user inactivity configuration parameters to bigbluebutton-web application and rename them to userInactivityLogoutTimerInMinutes and userInactivityResponseDelayInMinutes.