Switch from setup.py to pyproject.toml

[benmwebb]

Modern Python packaging wants us to use pyproject.toml rather than setup.py. Notably, the --install-option argument does not work with the latest setuptools, and the replacement, --config-settings, strongly recommends pyproject.toml.

The file might look somewhat like

[build-system]
requires = ["setuptools"]
build-backend = "setuptools.build_meta"

[project]
name = "ihm"
version = "2.4"
url='https://github.com/ihmwg/python-ihm'
authors = [
    {name="Ben Webb", email="ben@salilab.org"}
]
readme = "README.md"
description='Package for handling IHM mmCIF and BinaryCIF files'
classifiers=[
    "Programming Language :: Python :: 3",
    "License :: OSI Approved :: MIT License",
    "Operating System :: OS Independent",
    "Intended Audience :: Science/Research",
    "Topic :: Scientific/Engineering",
]
dependencies=['msgpack']

[tool.ruff.lint]
select = ["E", "F"]
ignore = ["E402"]

[tool.setuptools]
packages=['ihm', 'ihm.util']
ext-modules = [
  {name="ihm._format", sources=["src/ihm_format.c", "src/cmp.c", "src/ihm_format.i"], include_dirs=['src'], swig_opts=['-keyword', '-nodefaultctor', '-nodefaultdtor', '-noproxy']}
]

This doesn't currently handle the precompiled SWIG wrapper that we use in setup.py, though.