v4.0.0: OpenTracks

Changes:
- UI refactoring with a Bottom App Bar.
- Public API: implemented STOP properly.
- Cleanup: use explicit preference identifiers for TrackFileFormat.
- Improvements on BLE handler.
- Add exception handler and show error activity so users can send reports about bugs.
- Android 13: launcher icon, provide a themed icon.
- Change track title capitalization to sentences.
- Translations updated.

Bugfix:
- Sharing track added file suffix twice.
- Unit system not loaded corr