refs #15383 [fid] user management / registration

* migration of former core-module-package contents
* first adjustments of api client logon functionality
* fix initial registration step
* registration finalization adjustments
* fetch libraries on registration
* improved logon client method
* refresh logon only if stale
* throw exception on bad credentials
* adjust config files
* fetch user details only if logged on
* rename namespace, text domain as well as module and theme

* untrack compiled css
* let registration form look like login form
* rename ils driver for config injection by ils connection
* use aliases for authenticator and ils driver
* let authenticator support account creation
* enable account creation in base config
* override default account creation route

* introduce user controller and update action