Convert .res files using PyCORN (adapted to work with pyinstaller)

Requirments

convert_res.py is a modified PyCORN utility to generate .png plots from .res files
It does not accept any arguments;
When run converts every .res file in the same directory as the convert_res.py script.
Works with PyInstaller allowing convert_res.py to be bundled and easily distrubuted to people not familiar with terminal/console.

python convert_res.py

On macOS when creating an executable using PyInstaller an error related to tkinter may be issued. Please refer to this link for a solution.