Tools seems to fit better since the classes were a bit of a mixed bunch
and did not always manage.
Also simplified the structure of the SlugGenerator class.
Also focused EntityContext on shelves and simplified to use session
helper.
- Removed LDAP specific logic from login controller, placed in Guard.
- Created safer base user provider for ldap login, to be used for SAML
soon.
- Moved LDAP auth work from user provider to guard.