Merge branch 'header' into 'main'

.gitignore

.gitlab-ci.yml

README.md

examples/artist/projection.json

examples/generated/example_detector.json

examples/generated/example_header.json

examples/generated/example_image.json

examples/generated/example_projection.json

examples/generated/example_source.json

examples/thd_json/test_thd.json

pyproject.toml

scripts/generate_example_data.py

scripts/validate_file.py

scripts/validate_folder.py

src/thd_json/__init__.py

src/thd_json/detector/__init__.py

src/thd_json/detector/detector.json

src/thd_json/header/__init__.py

src/thd_json/header/header.json

src/thd_json/image/__init__.py