Stop lap timing after a certain period of inactivity (API or automatic)

[brentpicasso]

On the last lap the car will pull in and lap timing will continue indefinitely. We need a way to detect this idle condition and stop lap timing.

Possible candidates:

• zero-ish speed for X amount of time
• API that app can use to explicitly stop or reset lap timing.

[brentpicasso]

Corresponding app feature: https://github.com/autosportlabs/RaceCapture_App/issues/1566