Add background process to track distance traveled, calculate speed, lap time, avg lap time, overall time

[nauticalcoder]

We may be able to make this part of the current GPS process rather than a separate process. Alternately the distance traveled since last GPS reading could be part of the GPS service, but the additional mode specific values could be a separate process.

Haversine method (https://maker.pro/forums/threads/calculating-distance-using-gps.119820/)