* CheckoutProcessing work
add missing memoization and implement useRef strategically
This prevents effects from firing unnecessarily.
Tweak assets registration
Order hydration and checkout/ endpoint updates
Fix error handling
Error handling
* Missing isset in stripe
* Fedeback
* rename draft order ID action
* Todos
* Checkout class tidyup
* CheckoutProcessor placeholder
* ShippingMethodDataX to ShippingDataX
* Remove billing from checkout provider
* Remove billing data hook
* Remove billing from payment methods state
* Update typedefs
* Billing context
* Fix billing and shipping context persistence bugs
* Remove address form change
* Move phone back; another PR can deal with this
* Remove unused state
Mike Jolley