Remove eggsupport.py and require a setuptools versions which does not need it.

[icemac]

eggsupport.py is currently untested because it is not needed by recent enough setuptools versions.
So let's

• delete this module and everything which is depending on it
• require a minimum setuptools version which does not need it
• increase required min coverage

See #184 for more details.

[d-maurer]

Michael Howitz wrote at 2024-10-15 23:19 -0700:

`eggsupport.py` is currently untested because it is not needed by recent enough `setuptools` versions. So let's delete this module and everything which is depending on it + require a minimum setuptools version which does not need it. See #184 for more details.

`eggsupport` is not needed by `setuptools`; instead it relies on the `setuptools` infrastructure for the subcommand `test` abandonned by recent `setuptools` versions. The GHA runners use a recent `setuptools` version which means that they can no longer test `eggsupport`. We can drop `eggsupport` without the need to change anything regarding the minimum `setuptools` version.

[icemac]

Hm, GitHub still does not format e-mail replies properly and changing them does not make it any better, even tough it renders a correct preview. 😢

[icemac]

Fixed in #192.