Update Python Package Index for next release

[stweil]

As soon as there is a new release of hocr-tools, we should also update https://pypi.org/project/hocr-tools/ (release, supported Python versions, add project description, fix UNKNOWN for license).

[stweil]

As noted in issue #170, we prepared the last release some years ago. Perhaps it's time for a new one.

[mrghosti3]

Any updates for when new release is planned?

[stefan6419846]

It seems like there is no real progress with this - the last PyPI release has been made in 2017 (although without any assets), the release from 2019 is only available on GitHub. Recent Python and library versions tend to not be supported as well - the latest breakage I am aware of seems to be hocr-pdf which does not work any more since reportlab==4.1.0 from about a month ago.

While there is not much progress in the upstream repository, you might want to have a look at https://github.com/stefan6419846/hocr-tools - I am trying to keep up with the latest Python and external packages changes there and did some internal refactoring as well (allow library usage, provide type hints, avoid leaving file resources open, ...)