installation: moved from `setup.py` to `pyproject.toml`: - updated installation to use the now standard `pyproject.toml` instead of legacy `setup.py`. `setup.py` and other legacy files have been deleted. - removed outdated README4PACKAGERS - removed pylintrc which has not been correctly reviewed. Linter conf should go to `pyproject.toml` now. - [hatch](https://hatch.pypa.io) is now used as main building tool. However, thanks to the use of standards, other tools can be used too. - update .hgignore - several dependencies version bump, with code update to adapt to changes.

[DEFAULT]
xmpp_domain = server1.test
email_server = libervia-backend.test
email_port = 8025
email_admins_list = admin@server1.test

[component file-sharing]
http_upload_public_facing_url = http://localhost:7777
http_upload_connection_type = http
http_upload_port = 7777