ON Compass

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Update v3.1
- User interface improvements
- Text size adjustments
- Camera bug fixes
- App optimization

Update v3.0
- Improves images
- Fixed application crash issue
- App optimization

Update v2.1
- Bug fixes
- UI update

Update v2.0
- Fixed camera preview distortion issue
- Fixed text size and text color setting issue
- Fixed application crash issue
- Change sensor rate, code optimization