implementing #4120: User always needs to have the right to change password and hiding all user related menu contributions if no user is logged in
RolesSourceProvider to enable activities by cdm roles and protecting bulkeditors and term editors - #4055 (action enablement adapts to the users granted authorities)
base implementation and configuration for securing the editor - #4055 (action enablement adapts to the users granted authorities)
first bits for #3097 (disable editors if a user has insufficient grants for a taxon or taxon node) - TaxonEditor disabled, views still to do
fixing #3096 (visual response if a user is not granted to edit a specific part of the classification tree)