[aguirreSL]

Replaces setup.py with pyproject.toml, keeping the name, version (0.1.2a), authors, license and packages.

Changes to what gets installed:

1. Python 3.10 or later is required, and the classifiers list 3.10 to 3.12. The previous ones (3.6 to 3.8) are past their end of life and no longer installable with current NumPy and Numba.
2. Each dependency has a lower bound, the first release with wheels for Python 3.10. There are no upper bounds.
3. soundfile is dropped, since no module imports it.
4. more-itertools and kaleido move to the extra waterfall, since only plot_waterfall uses them, and it imports more_itertools inside the function. The extras test (pytest) and docs (sphinx, sphinx_rtd_theme) are new.

Other files:

1. requirements.txt is removed. Its pins were from 2019 (numpy==1.17.4, scipy==1.3.3) and did not install on current Python.
2. environment.yml was an export of one Linux machine with Python 3.7. It now lists the packages PyTTa needs, from conda-forge, and installs PyTTa from the clone.
3. The publishing workflow builds with python -m build in place of python3 setup.py sdist bdist_wheel.
4. The README states the requirements (with PortAudio on Linux) and the ways to install.

Checked by building the sdist and the wheel with python -m build, with no warnings, and installing the wheel in a new virtual environment with Python 3.12. The package imports from site-packages, and the test suite gives the same result as on development (7 known failures, fixed by #52 and #60). pip install -e ".[test]" also works, which is how #61 installs PyTTa in CI. I did not test environment.yml with conda.

Co-Authored-By: Claude Fable 5.1 noreply@anthropic.com