Peter M. Groen / CLI11

* docs: fix some Codacity recommendations

* chore: update copyright year

* style: more codacity fixes

* style: fix issues reported by Codacity

* Add copyright check

* Remove old license message

* Implement suggestions from code review

* Fix includes in examples

* Fix order

* Align with other subcommand files

Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>

* Add cpplint config file

* Add cpplint to CI

* Add checks

* Add docker container tag

* Unindent container

As suggested in code review

Co-Authored-By: Henry Schreiner <HenrySchreinerIII@gmail.com>

* Fix cpplint issues

* Fix clang-format

* Include and fix modern cpplint runtime/int

* Include and fix cpplint build/include_order

* Revert "Include and fix cpplint build/include_order"

This reverts commit bddb6a2d6744c5397f387ccd03416a1ec5e29862.

* Update explanation, sort alphabetically

* Implement suggestion from code review

Co-Authored-By: Henry Schreiner <HenrySchreinerIII@gmail.com>

* Include cstdint header, prefix its symbols with std::

* Forgot std::

Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>