add new functionality to qr code generator

[krz]

• Checks for valid input for box size, border size, and error correction level.
• Validates if the file format is correct and defaults to .png if not.
• Optionally add a logo in the center of the QR code if a valid image file is provided.
• The logo is resized and centered, ensuring it does not obstruct the QR code readability.
• Input for error correction is now handled with a helper function that returns the correct constant.
• Default file format validation and handling for common issues like invalid filenames or colors.
• Moved error correction handling to its own function for clarity.
• Modularized the QR code generation function to handle all parameters, including optional logo.

[hackelite01]

Kindly make changes again cause some of the files are modified.