Add serial port upload feature with MSP protocol support & UX

[cvetaevvitaliy]

Summary of changes:

• Implemented font upload functionality directly to the device via serial port using the MSP protocol.
• Integrated dynamic serial port selection with automatic port list refresh.
• Add UI buttons for selecting port and uploading fonts, along with real-time upload status display.

Why this matters:

These enhancements significantly improve the user experience by enabling seamless font updates to the device without extra steps, making the font editor more interactive.

How to test:

1. Open the font editor and connect your device via serial port.
2. Use the “Select Serial Port” button to choose the correct port.
3. After loading or editing a font, click “Upload to device”.
4. Observe the upload progress and status messages.
5. Verify the updated font appears correctly on the device.

Future improvements:

• Implement font reading functionality directly from the device to enable two-way font management and editing.

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[VitroidFPV]

@cvetaevvitaliy apologies for the delays. Please test the changes made, it works fine from my testing though