The delivery promise is now a two-day range

Within a state, the delivery promise is now a two-day range, and the cut-offs have moved.

• The cut-offs. Booked and ready before 13:45 Monday to Friday, or before 11:45 on a Saturday: delivered that day or the next working day. At or after the cut-off: the next working day or the working day after. The old cut-off was 16:30 every working day.
• Sundays and public holidays are still off. Booked on one, the delivery is the next working day or the working day after.
• schedule.earliest_delivery is filled on standard quotes, deliveries and webhooks. It is the range's first day, and deliver_by is the last. It used to be null outside inter-state routes. It is written at close of business (19:00) like the other two, so read the day: a delivery can arrive at any time on it.
• null still happens. A delivery booked before this change has no earliest date, and after a delivery.schedule_changed the new deliver_by is the whole promise, so earliest_delivery is null and previous_schedule keeps the range. Show deliver_by alone when it is null.

pickup_by and deliver_by keep their meaning, and close of business is still 19:00, but a delivery booked between 13:45 and 16:30 now gets later dates than it did. Nothing is removed or renamed.