[FEATURE] Add Option to Display Imperial Units

[Garrisonsan]

Is your feature request related to a problem? Please describe.
When viewing location detail cards (the ones that display altitude, speed, etc.) and more generally whenever the app displays your current distance from another location, there is no readily apparent way to change from metric to imperial units.

Describe the solution you'd like
Please add a feature to display units in imperial. This could be done via an app-wide toggle in settings, or possibly set by default based on the metadata from the device Locus is installed on.

Describe alternatives you've considered
The only alternative currently is to convert units outside the app.