Allow switching to "miles" from "kilometers" in status bar measurement section

[rickmastfan67]

I would love for it to be possible to have the status bar measurement section to be able to be switched back and forth between kilometers and miles by just left clicking on it.

The reason is because sometimes I write down the mileage (in miles from the trip meter in my car) from an intersection to a road sign (like for when the speed limit changes) so I can split the way at the correct place where the speed limit goes up/down since I don't have a GPS unit (well, my camera has one, but it takes forever to get new coordinates when I want them and if I'm driving, it's not possible to use that function of it).

Being able to use the status bar measurement section to help in getting the correct location would be greatly appreciated.

[Don-vip]

In 6056/josm:

fix #6515 - Allow switching system of measurement from a single click on status line

[Don-vip]

Measurement plugin updated in [o29750].