Igor2

- setup: bump numpy to 1.25.1
- tests: workaround for broken numpy repr

- docs: cleanup readme

- ci: fix automated pipeline

- BREAKING CHANGE: remove the igorpy compatibility layer
- docs: include Readme.rst for description on PyPI
- tests: migrate to pytest best as possible
- ref: remove hard-coded logging statement from __init__
- ref: flake8
- ref: remove clutter LGPL notices, nobody does that anymore and
the LGPL is advertised sufficiently elsewhere

- fix: merge all pull requests to original igor project (1, 2, 3)
- setup: migrate to pyproject.toml