- cleanup
 - convert timestamp to use monotonic clock
 - try to store recorded event into list instead of hasmap
 - don't record message when meeting isn't being recorded
Merge branch 'merge-polling-with-master' of github.com:bigbluebutton/bigbluebutton into merge-polling-with-master
Merge branch 'fix-recording-to-maintain-backward-compatibility-with-0.81' into merge-polling-with-master