Implement persistent storage for last used port settings

[LepreconSTR]

Current behavior
The application does not save port configuration settings (baud rate, DTR, RTS, etc.) between sessions. Each time a port is switched or the application is restarted, users must re-enter all configuration parameters manually.

Problem description
The lack of persistent storage for port settings creates several usability issues:

• Time-consuming manual reconfiguration
• Increased risk of configuration errors
• Reduced user productivity
• Inconvenience when frequently switching between different port configurations

Proposed solution
Implement a feature to automatically save and restore the last used port configuration settings. This would include:

• Baud rate
• Data bits
• Parity settings
• Stop bits
• Flow control settings (DTR, RTS)
• Other relevant port parameters

Expected benefits

• Significant time savings during configuration
• Improved user experience
• Reduced configuration errors
• Enhanced productivity when working with multiple port configurations
• Consistent behavior across application sessions

[sanny32]

I think it can be done