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

WOO-936

Solved bugs caused by the new way of handling the gateway with uuids instead of the original id.

* $paymentMethodInformation is now nullable at class level so it can exist, but be nulled.
* Changed the way $this->id in ResursDefault is set and handled, since it is more or less multidimensional.
* canInitializeGateway is built on checks on either the PaymentMethod from ecom, or an existing order (if one of them is filled, the gateway can pass through the initializer).
* Added getProperGatewayId is built on the "canInitialize" since it is not only used to instantiate the gateway in the checkout, but also as a part of the order view.
* Updated get_title to reflect the correct payment method or title.
* Updated filter handler for metaboxes, as they should not be active on orders that does not belong to Resurs.
* Added Metadata::isValidResursPayment