Use an opt-out flow for comments in video, springify notifications and
notifications handlers

Data model
REST interface
GUI element to watch a live stream
GUI element to see the upcoming live streams
GUI element to edit live stream events

Allow course owner to enter curriculum management site (with reduced
permissions), add configuration in type and element to aggregate the
lecture statistics, add three levels of details about lectures (list of
users, list for a specific user with all courses, details of a user in a
course)

Implement relation between identities with a configurable role,
administration to manage the roles, and the relations in user
management.

Transfer metadata by copy / upload / download of zip files, unify copy
of streams, copy metadata during copy of courses, remove backwards
compatibility mode for import

Move the functions of OlatRootFile and OlatRootFolder to the Local
implementations to simplify the use of VFS, implements factory methods
in VFSManager, reduce the number of call to meta informations in folder
listing