Release v2.0

What's Changed

• Fix release type for github workflows, switch to new auth by @SlouchyButton in #146
• Add setuptools dependency to requirements.txt by @SlouchyButton in #147
• Add id-token permission for trusted publishing by @SlouchyButton in #148
• Drop the dependency on six by @praiskup in #150
• Fix support for automatic manpage generation by @praiskup in #154
• Rework of build system to use more modern standards by @SlouchyButton in #153

Full Changelog: v1.18...v2.0

Breaking changes

• File version.py from package got removed, use version() from importlib.metadata instead