FR: make it easy to swap two keys

[aspiers]

When setting up a keyboard, I often find that I need to swap two keys around. It would be great if Chrysalis made it easy to do this. For example, when one key is selected, you could right-click another key and a drop-down menu would appear, with one of the items being "Swap with selected".

[aspiers]

5 years later, my Keyboardio Preonic just arrived and I find myself back here with exactly the same problem.