Consider vendoring `ply`

[RaitoBezarius]

Hi there, you are using the ply dependency, as the author said in https://github.com/dabeaz/ply#important-notice---october-27-2022, he won't make any new release.

Therefore, packaging your project is difficult given this new constraint.

Can you consider vendoring this dependency like pycparser for example?

[stebunovd]

Hi @RaitoBezarius,

thank you for the idea and the context. I think it makes sense. We'll consider doing it in future releases.

[spenserblack]

Depending on how you vendor these files, you might want to mark them as vendored for GitHub.

# .gitattributes
path/to/ply/** linguist-vendored