Chess-graph

In this version, there have been general bug fixes and enhancements. However, the most notable thing is that the program now runs 2-3x faster as we are using a different program to read the PGN files. We are now using the `pgnparser` program, and not `python-chess`.

Other than that, custom branching has been implemented in a way that now when you look at the custom branching depth, it is the same as the default depth.

Version 1.5.0 is what everyone who helped contribute or comment on this project is yearning for - the finished version! **Every single suggestion** has been implemented, and they now all work perfectly. As well as that, the PyPI package is finally up-to-date and functional, and the READme has been greatly expanded.

New as of this release:
- Custom openings fully supported
- Instead of zooming in for the user, now the custom openings will *only* display that opening.
- Download wrapped in main function - you can now download and run in just one line!
- Bug fixes, small enhancements, and general improvement of the repo + module


*Don't forget you can always access the PyPI package at https://pypi.org/project/chess-graph/ or with `pip install chess-graph`!*

Updated README.md to show how to use with PyPI package (available with `pip install chess-graph`).

Version 1.3 has been skipped due to conflicts with the PyPI version of this project. Now, the versions will match.

This version is in sync with the official PIP version, which is available here: https://pypi.org/project/chess-graph/

Now, the segments are shaded based on how often white/black win. The code is also wrapped into one main function with default arguments that can be imported!

From here on, there are only a few small improvements to be made before completion!


In this version of the program, you can now hide very small slices! So, instead of seeing the 'chicken scratch' I have heard the outer slices being referred to, you can simply prevent them from showing up with a boolean in the code!

This is on by default, but can be changed.