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

* While updating RWC-330, RWC-76 was included.
* Fees will only be supported in non RCO mode due to how RCO works as we very much have to create the RCO iframe before the woocommerce handlers.
* getAnnuityFactors can now be chosen to display or return. See RWC-331. It can also be chosen to show product price or a custom price.
* Added getResursMethodFromPrefix() to make sure we can store payment method data in an early state for the session (for fee handling mostly)
* Added internal_tax setting for the fee handling. See RWC-318. This is the way we apply tax classes to the fee.
* Some slugs for language fixed.
* setFee changed @since because it has been activated.

Close #81.
Close #82.
Close #83.
Close #84.