Customer order fulfilment improvements

Ongoing we see the need to store the following pieces of information on the order:

• expected delivery date (either at delivery level or line level)
• deliveries are broken further at fulfilment centres (need mechanism to breakdown deliveries and move items that are delivered separately)
• refunds at item level (if we have "move item to separate delivery" then this becomes easier, alternatively we could have a separate "returned items" delivery when Items are returned)
• need additional fields on the order to store custom information (e.g. order updates, various flags for custom implementations)
• need additional fields on the item line level to store custom information (e.g. item level delivery updates)
• listener on the order payment confirmation to set the default expected delivery date from the carrier SLA max days