LDEV-4935 Secure lesson chat (presence) websocketsNickname is taken from session, not from incoming parameters. User getschecked if he participates in the given lesson.Simplified code, clean up.
LDEV-4932 Secure edit in monitor with CSRF Guard* In order to secure /definelater.do path, added definelater() method toAuthoringController to the tools missing it* Remove unnecessary forms from monitor in Vote, NB, QA tools