Mark registrations as canceled rather then deleting them when a user un-registers.
Mark registrations as canceled rather then deleting them when a user un-registers.

registripe/registripe-core,stephenmcm/silverstripe-eventmanagement,burnbright/silverstripe-eventmanagement,silverstripe-australia/silverstripe-eventmanagement,souldigital/silverstripe-eventmanagement,souldigital/silverstripe-eventmanagement,burnbright/silverstripe-eventmanagement,stephenmcm/silverstripe-eventmanagement,silverstripe-australia/silverstripe-eventmanagement