Merge pull request #21 from PH-KDX/support-python-312

add python 3.12 classifier

bump version number in __init__.py

update changelog

fix flake8

update flake8 version in pre-commit config

pin flake8 version in github lint

add python 3.12 to testing workflow

update version

update changelog

reformat release workflow

fix isort, black, flake8

make plan functions strictly mypy compliant

make api functions strictly mypy compliant

make nav function strictly mypy compliant