Allow sorting shipping methods and payment gateways

[piotrpog]

It would be useful if admin could sort (drag and drop) shipping methods and payment gateways, so their order could be changed that way on frontend too.

[bartrylant]

I see this FR is 3 years old. It would still come in handy, since you can also set the first shipping method to be the default method (and already be selected on the front-end). However, that's quite useless if you cannot change the order of the shipping methods.

[wmdhosting]

+1