* Recording formats should not be accessible to students unless specified as safe
* A global setting will now list all the "safe" formats for students
* A new capability 'mod/bigbluebuttonbn:viewallrecordingsformats' will allow users to
see all formats (as long as they can manage recordings also)
* BBB has specific completion indicator that need to be taken into account
* Fix mock requests so we can send participant id and then attach events to them
* Refactor slightly the broker to split meeting logic from request (decoding)
* Fix update completion state cron
* Only delete "Create" or "Update" logs when a recording has been effectively created
* Reschedule task if fail or logs are left over
* One task per meetingid
Laurent David