Remove `setuptools` install dependency

[icemac]

FEATURE REQUEST

After switching our repositories to PEP 420 namespaces in #194 most of the packages will no longer need the setuptools install dependency and the ones which still use pkg_resouces need to to be switched to importlib.resources because pkg_resouces is deprecated and to be removed from setuptools soon (November 2025?).

Request:

• get rid of setuptools in setup.py als install_requires via the bin/config-package script and fix the fallout it might cause.