Checkout for WooCommerce - CheckoutWC 9.1.8

Fix - Fix fatal error from non-existent shipping method
Fix - Fix Klarna Payments on the order pay page
Dev - Allow a cookie for template previewing

Fix - Fix bug that prevented a shipping method from properly being set when switching to pickup
Fix - Only get instock products for cross sells
Fix - Protect against potential fatal error
Dev - Add SKU to cart items as data property

Fix - Fix bug that caused the buttons on the cart item variation edit modal to be untranslated
Fix - Fix bug that prevented the image from changing when variation is changed in modals