That v8 rumble

This release is timed for kicad v8 release since it has some compatibility fixes.

The only new feature here is extra fields support for EasyEDA. Also the package is now available on pypi: https://pypi.org/project/InteractiveHtmlBom/

Notable commits:

• 5740ad8 Add extra field support to EasyEDA parser
• a2274b4 Add pyproject.toml and pypi publish workflow
• e0481e9 Fix kicad dnp detection for nightly
• c77c74a (eagle) Fix #429