tornevalls-resurs-bank-payment-gateway-for-woocommerce

RWC-63 Implement RCO legacy (postMsg) #1
Including RWC-184 #3

* Added resurscheckoutjs framework for legacy handling.
* Enabled generic logging entries for frontend events.
* Removed todo for using nonces in RCO. nonces are already used through process_payment.
* Initializing RCO Legacy only if checkoutType is of type RCO.
* Added filter in pluginhandler to add an extra script if RCO legacy is detected (rbwc_js_loaders_checkout).
* Initial handler for creating legacy payments is in place. We still need purchasefail and purchasedenied.
* Using same API request to create legacy payments (resursbank_checkout_create_order) as v2/facelift do.
* Added getCustomerFieldsTypeByLegacy to handle legacy delivery address and billing address fields where they look different in legacy.
* Now storing paymentMethod in session and metadata to make data trackable.
* Injecting proper payment method title via woocommerce_order_get_payment_method_title and get_title when in RCO (via configuration).
* Now using generic function to validate cart content.
* Now extracting origin hostname from RCO iframe url, since legacy is depending on it.
* Added function to extract the session based payment method from session. #3
* Added config option rco_method_titling to make it possible to choose how payment methods are shown in RCO mode.