Merge branch 'develop' into feature/language

packages/CLI11/.clang-format

packages/CLI11/.github/CONTRIBUTING.md

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

packages/CLI11/.gitrepo

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

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

packages/CLI11/.travis.yml

packages/CLI11/README.md

packages/CLI11/azure-pipelines.yml

packages/CLI11/book/chapters/config.md

packages/CLI11/book/chapters/flags.md

packages/CLI11/book/chapters/formatting.md

packages/CLI11/book/chapters/installation.md

packages/CLI11/book/chapters/options.md

packages/CLI11/book/chapters/toolkits.md

packages/CLI11/cmake/CodeCoverage.cmake

packages/CLI11/conanfile.py

packages/CLI11/include/CLI/App.hpp

packages/CLI11/include/CLI/Option.hpp

packages/CLI11/include/CLI/Validators.hpp