Working on anonymous edit and deletion of registrants

...stall/recurring_events_registration.registrant.config.yml

...egistration/recurring_events_registration.permissions.yml

...ts_registration/recurring_events_registration.routing.yml

...nts_registration/recurring_events_registration.tokens.inc

...s/recurring_events_registration/src/Entity/Registrant.php

...vents_registration/src/RegistrantAccessControlHandler.php

recurring_events.api.php

recurring_events.permissions.yml

recurring_events.tokens.inc

src/EventSeriesAccessControlHandler.php