[Issue]: Use the step counter to drop GPS drift

[anis022]

Branch Name

feature/191-pedometer-drift-filter

Description

This is a stretch goal, do not start until the other issues are done.

GPS drifts while someone stands still. Those fake metres get added to the patrol distance, which is a number we show on the summary screen. If the step counter says nobody walked between two fixes, the fix is drift and we drop it.

Scope

• CMPedometer on iOS, the step counter sensor on Android
• Compare the step count between two fixes. No steps means drop the fix
• Put it in the native tracking service, next to the buffer
• Fall back to the current distance filter on phones with no step sensor
• Add NSMotionUsageDescription to Info.plist, or iOS refuses the pedometer

Acceptance Criteria

• Standing still for 10 minutes adds close to zero distance
• A normal walk records the same distance as it does today
• A phone with no step sensor still records normally

Notes

Depends on the native point buffer, since it belongs in the same service. Needs a Mac for the iOS half.

Checklist

• I have checked for duplicate issues.
• I have assigned the issue to the correct project board.
• I have tagged the issue properly.

Code of Conduct

• I agree to follow this project's Code of Conduct