Merge branch 'modernise_project_structure' into 'master'

.coveragerc

.gitignore

.gitlab-ci.yml

MANIFEST.in

Makefile

doc/conf.py

pyproject.toml

setup.cfg

setup.py

src/km3io/__init__.py

src/km3io/_definitions/__init__.py

src/km3io/_definitions/applications.py

src/km3io/_definitions/daqdatatypes.py

src/km3io/_definitions/fitparameters.py

src/km3io/_definitions/mc_header.py

src/km3io/_definitions/pmt_status.py

src/km3io/_definitions/reconstruction.py

src/km3io/_definitions/root.py

src/km3io/_definitions/trigger.py

src/km3io/_definitions/trkmembers.py