Remove unnecessary delete

Revert deleting Close method call

While building the docker image pass the arguments `--build-arg
"host_uid=$(id -u)" --build-arg "host_gid=$(id -g)"` so that you can
use the outputs of the compilation outside

Update Docker ubuntu version and add Cython

Add dependency to Cython in pyproject.toml file

Update tox configuration for unit test

Remove deprecated setup_requires

Update README, set myself as current author/maintainer, and move most of setup.py to the configuration file.