Make standalone builds (automated)

[lrq3000]

Make and distribute for each release a binary that bundles the Python interpreter, for each supported platform.

Not yet sure what will be needed precisely to achieve that, but here are some rough pointers:

• make a GitHub Actions workflow to auto push to PyPi on GitHub new release.
• use pyInstaller to make frozen builds?
• to make multi-platforms builds, maybe combine with cibuildwheel?
• automate the building and distribution process (attaching standalone binaries on GitHub Releases) by using a GitHub Actions Workflow?

[lrq3000]

See:

• https://data-dive.com/multi-os-deployment-in-cloud-using-pyinstaller-and-github-actions/
• Feature: An official GitHub Action to build PyInstaller executables pyinstaller/pyinstaller#6296
• https://github.com/marketplace/actions/pyinstaller-action and https://github.com/Martin005/pyinstaller-action