ADD: Added "archived" field to event. Events can now be set to be archived.
ADD: Public events are now filtered to be non-archived.
ADD: Add filter for events admin list that filters archived events.
ADD: Added TCA and SQL for event year.
ADD: Added domain model and repository for event year.#
ADD: Add user interface for event years. Can now be added, listed, edited and deleted.
ADD: Event Years can now be assigned to events in the fronted.