Class Conversion

[thomas-osgood]

Overview

General

• Converted the main logic to a python3 class that can be imported by other programs.
• Added if __name__ == "__main__" statement.
• Moved argument parsing to new main() function.

Class-Specific

• New class name: QRConverter.
• Main Logic Function: convertQRCode
• Constant values turned into class variables.
• Helper functions marked as private using "dunders" (__).