OO-3295,OO-3538: replace Jersey with Apache CXF (JAX-RS 2.1, Spring integration), remove the JAX-WS stack from Sun, update support for OpenMeetings (patch S. Clemenz)

OO-3292: in course member management, add the member which come from the curriculum, refactor the queries to be more efficient and in their own "manager" class

OO-3523: disable the possibility to skip the launch page in LTI course element if the configuration at the LMS level say so

OO-3303: Show number of users in report part for session informations, exception handling and wording

OO-3532, OO-3532: add a third queue especially for deletion and export of users to not disturb the other services, export participant folder's drop box of users

OO-3477: remove uncalculated statistics, remove user property from logging table in setup script, adapt creation and update of the temporary table for course statistics

OO-3489, OO-3490, OO-3491, OO-3495, OO-3499, OO-3500, OO-3501: finish the export process, delete files after zipping, send email... and more exported data

OO-3489, OO-3492, OO-3493, OO-3494, OO-3496, OO-3497: infrastructure to export user data, export  portraits, notes, personal folder, calendars, subscriptions, delete calendars after usser deletion

OO-3295: update hibernate to version 5.3 (JPA 2.2), infinispan 9.2 and use the new streaming API in some key queries

OO-3477: really remove initial author from repository entry, update course log with the new policy of user properties, springify export manager and co., make logging object annotation based

OO-3473	: delete the temporary files only at the end of the wizard and not after the first created element

OO-3472: rewrite the delete routine to delete only the file of the edited checkbox, implement a check to not delete the file if it's used by an other checkbox