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

RWC-407
Ref WOO-689.
Ref WOO-690.

* Changed some returndata-points to protect against weird xdebug errors (that only occurs on some steps).
* Changed the way getOrderInfo is handled since data can reach that method without content.
* Fixed decryptdata problems (when meta is missing, xdebug faults).
* Fixed so metadata can be returned even if the plugin does not own the key (internal plugin keys always override).
* Added canIgnoreFrozen (emergency meta-flag) for frozen orders in "completion mode".
* Fixed issues with credential meta when it does not exist in orderdata array.
* Fixed proper return object on getPayment request (another null-issue from xdebug uncovered).
* Fixed (hey xdebug) so data from meta is only tryig to decrypt if orderdata first exists and/or is not empty.