implementations of repository entry which was only used by one method

status, all users, guests flags

organization, implement segment view for user visit card to better
inline in user management, implements several features for all roles
(allow enrollment, mandatory confirmation email by enrollment, allow
autocomplete, bulk changes...), add roles like lecture manager, quality
manager..., enhance the roles editor in user management

OO-3297: refactor the user management to use organization for managing the roles instead of named security groups

OO-3307: update d3.js to version 4.13.0, update charts in portfolio, QTI statistics and course statistics

OO-1873: replace the listing of booking by a native query optimized for our standard setup, replace the .hbm.xml with annotations, add more fetching overall