Add manpage and migrate to pyproject.toml

[branchv]

I noticed the manpage was intentionally omitted from setup.py since bf6eb98, however manpages are now recognized by installers like pipx and homebrew (with uv to hopefully follow soon). So this installs them at the standard share/man/man1 path

Also, I took the opportunity to migrate to pyproject.toml(the modern replacement for setup.py favoring static metadata). Things should generally be the same, but note I:

• Replaced the custom version detection with setuptools_scm (which is generally more familiar to packagers and allows easily overriding the version when building from a source tarball)
• Removed unused .pylintrc and merge mypy.ini and setup.cfg into pyproject.toml
• Added an explicit requires-python = ">=3.9" (which is the currently supported pythons, lmk if this should be something else)

[walles]

The old setup.py used the README.rst as long_description.

Does setting readme here have the same effect?

For clarity, I don't know what the effect was of setting that...

[branchv]

Yup they both map to the core metadata field Description which for example PyPI displays: https://pypi.org/project/pxpx/

[Copilot]

Pull Request Overview

This PR modernizes the Python packaging setup by migrating from setup.py to pyproject.toml and adds manpage installation support for package managers like pipx and homebrew.

• Migrates from setup.py to pyproject.toml with static metadata configuration
• Replaces custom version detection with setuptools_scm for standardized version management
• Consolidates configuration files (mypy.ini, setup.cfg) into pyproject.toml

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
setup.py	Removed entire custom setup script with version detection logic
pyproject.toml	Added modern Python packaging configuration with metadata and tool settings
tox.ini	Updated test environment to remove version.py dependency and cleanup commands
px/px.py	Updated version imports to use __version__ from setuptools_scm
setup.cfg	Removed file, configuration moved to pyproject.toml
mypy.ini	Removed file, configuration moved to pyproject.toml
.pylintrc	Removed unused pylint configuration
devbin/test_clone_and_build.py	Removed setup.py build step and fixed import ordering
.github/workflows/macos-ci.yml	Removed version.py tox environment from CI
.github/workflows/deployment.yml	Updated deployment workflow to check version after build

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[walles]

Beautiful, thanks Vincent! :)