Add iPad layout constraints

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Update to the YOLO iOS App with improved model downloading and interface adjustments.

📊 Key Changes

• Updated instructions for exporting CoreML INT8 models using the ultralytics Python package.
• Incremented the app's marketing version to 8.2.0.
• Increased build number in Info.plist to 24 and included a new key indicating that the app does not use exempt encryption.
• Interface and layout updates in the Main.storyboard to accommodate different device sizes and UI changes.

🎯 Purpose & Impact

• Provides clearer guidance on obtaining YOLOv8 models, ensuring users correctly set up the app with all the necessary models.
• Version bump signals an updated app with potential new features and fixes to users (version 8.1.0 to 8.2.0).
• The new key in the plist ensures users are aware of the encryption status of the app, which may be important for compliance with various regulations.
• UI adjustments for a more consistent experience across different devices, helping users to interact more easily with the app.