* Hook up checkout validation with context
* Make sure hasValidationErrors is up to date in onCheckoutProcessing
* Move validation check inside CheckoutProcessor's processCheckout
* Make sure all checkout form fields have a unique ID
* Don't clear checkout context errors in shipping context
* Move CheckoutProcessor to the top so scrollToTop works
* Do not disable Place Order Button if there are errors
* Split checkValidation and processCheckout in Checkout Provider
* Refactor event emitter to use Maps
* Save payment method errors to validation context
* Show an notice when a payment method has an error
* Make sure JS errors during payment are displayed
* Remove error notice when payment method doesn't return an error anymore
* Make sure payment methods know if shipping and billing addresses are the same
* Make sure checkout is only processed if payment methods didn't fail
* Make sure state input also has an id
* Clear input and select errors on unmount
* Pass id to CountryInput and StateInput
* Fix function name
* Add missing default context values
* Move onCheckoutCompleteError effect to CheckoutBlock
* Remove conditional from shipping setHasError
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