Replace dependency on PLY by another library #103
Description
On the Github page for the PLY project (PLY on GitHub) it reads that the author has abandoned the PLY project. Quote: "After 25 years, I've decided to abandon the PLY project. No further maintenance is expected. At this point, there are many high-quality parsing libraries that you might consider using instead."
This is going to be an issue in the future, especially because there is also an open CVE on the latest version of PLY.
This causes some public and private package repositories to block this version of PLY and therefore jsonpath_rw cannot be installed without breaking the dependency.