Linting

Delay import from matplotlib_inline.backend_inline

setup.py: Remove commands symlink, unsymlink

pyproject.toml: Back to include-package-date=false

setupbase.py (find_packages): Unused, remove

pyproject.toml: Fix case of packages

.github/workflows: Update actions/setup-python cache-dependency-path

setupbase.py: Remove duplication of package_data

pyproject.toml: Move metadata, setuptools config here from setup.cfg

ignore some traitlets types