v3.24.1: OpenTracks

Changes:
- Added API for starting recordings from other applications (disabled by default)
- Shortened ISO8601 track names
- BLE distance sensors: store GPS-locations based upon previous GPS-locations

Bugfix:
- While recording: fixed crash when opening charts
- TrackDataHub should end processing after stop()
- Prevent rare crash while deleting tracks

Developer:
- Refactored package structure
- Monotonic clock
- Value objects for heartrate, cadence, and power