* remove calculating as a checkout status (making it separate)
* include checkout is calculating for determining whether to flip payment status to process
* only change payment method state for status changes if needed
* fix reducer for shipping state
* include checkoutIsCalculating for determining whether to show validation errors in checkout block
* change where currentStatus is defined
* fix bug with saved payment method option
* Allow for priority to be set on event emitters
* Add payment event emitters
* add new actions/status to checkout state context
* implement event emitters in payment data context
* refactor checkout state context to use new actions in event emitters
* refactor checkout processor to handle new event emitters
* fix type-defs for registered payment methods
* register observer for cheque payment method integration
* add inline todo
* fix sort
* fix tests and add test for priority usage in event emitters
* remove todo and just add explanatory comment
* condense sort logic
* lowercase test description
* abstract emitter callback to reduce code
* don’t process passed in errors if it’s undefined
* improve error response expectation for payment processing event observer
* Rename and move existing checkout provider to checkout-state provider.
This allows us to re-use the interface exposed on this provider for cart and checkout blocks.
* refactor checkout provider to implement the new checkout state provider.
* Add Cart provider and export
* fix type-defs
* fix editor context provider and ensure all `isEditor` checks come from this provider
* fix type definition
* implement cart provider
Darren Ethier