CGRtools issue makes the library impossible to install

[asiomchen]

I recently encountered issues with installing reaction_utils in a new environment.

Turns out I was using the cached version of the CGRtools, which now fails to build, because it's non PEP517 compliant and fails to build on recent Cython versions.

I created drop-in replacement - cgrtools-plus - fixes both issues and adds prebuilt wheels for most platforms.

It should be enough to replace CGRtools with cgrtools-plus and everything will work again.

https://github.com/asiomchen/CGRtools

https://pypi.org/project/cgrtools-plus/4.1.35/

[SGenheden]

Use version 1.9.3