Create Proper Command-line Input Handling

[normanhh3]

Proposed command-line options:

• Provide an input file containing a word list and hints to work off of
• Provide an output file path for the puzzle result to go to

-[l]ist [File Path] - Input word list file
-[o]utput [File Path] - Output file path

Prime candidate for argument parsing: https://fsprojects.github.io/Argu/

Argu version 5.2 is already added to the project as a dependency.