Place a shipping method anywhere in the checkout list

Before, you could only pin a shipping method to the top or the bottom of the list. Now the editor shows where a method appears for buyers in a country, and a "Change placement" dialog lets you move it up or down with arrows, also against other pinned methods. The shipping methods list shows the same order as your checkout. Methods pinned to the top also keep the right order now, which did not always happen before.