Use config descriptor system from pystencils

• Adapt the config submodule to use the config and category descriptors provided by pystencils
• Adapt the noxfile to always pull the recent version of pystencils before a testsuite run
• Extend the CI to test against Python 3.13

changed milestone to %Version 0.1

assigned to @da15siwa

added 4 commits

• 1d98cef0...23860e3d - 2 commits from branch master
• 0890d5be - Merge branch 'master' into fhennig/update-config
• 7033baf8 - Adapt noxfile and CI

Compare with previous version

changed the description

marked this merge request as ready

requested review from @ob28imeq

mentioned in commit 0c2a4a6a

merged