no-jira: update some plugins in pom, fix some compile issues with Java 10, fix memory renderer if run with Java 10, remove unused dialect property in olat.local.properties for tests

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

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