Metric system

[9182736450typist]

This feature is very simple. An option to use metric units and search cities outside the US would be awesome to include.

[netbymatt]

Metric was a part of this app previously. I think I dropped it as part of the conversion to 5.0, but ti could certainly be brought back.

For outside the US please see this discussion. https://github.com/netbymatt/ws4kp/issues/16#issuecomment-1313862611