Merge branch 'develop' into feature/integration

packages/CLI11/.appveyor.yml

packages/CLI11/.github/CONTRIBUTING.md

packages/CLI11/.github/workflows/build.yml

packages/CLI11/.github/workflows/tests.yml

packages/CLI11/.gitrepo

packages/CLI11/.pre-commit-config.yaml

packages/CLI11/.travis.yml

packages/CLI11/CHANGELOG.md

packages/CLI11/CMakeLists.txt

packages/CLI11/README.md

packages/CLI11/azure-pipelines.yml

packages/CLI11/book/README.md

packages/CLI11/book/chapters/an-advanced-example.md

packages/CLI11/book/chapters/config.md

packages/CLI11/book/chapters/flags.md

packages/CLI11/docs/Doxyfile

packages/CLI11/include/CLI/App.hpp

packages/CLI11/include/CLI/Option.hpp

packages/CLI11/include/CLI/TypeTools.hpp

packages/CLI11/include/CLI/Validators.hpp