Peter M. Groen / CLI11

* chore: update clang-tidy

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* refactor: address clang-tidy

* fix: C++11 support

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* chore: two more clang-tidy fixes

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* fix: get_inject_separator should be bool

* refactor: addressing review feedback

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Philip Top <phlptp@gmail.com>

* Apply suggestions from code review

* Update include/CLI/Config.hpp

* Update include/CLI/Config.hpp

* Update include/CLI/Config.hpp

* Update include/CLI/Config.hpp

Co-authored-by: Philip Top <phlptp@gmail.com>

* docs: fix some Codacity recommendations

* chore: update copyright year

* style: more codacity fixes

* style: fix issues reported by Codacity

* spelling: argument

* spelling: conflicts

* spelling: correctly

* spelling: default

* spelling: description

* spelling: empty

* spelling: enum

* spelling: javascript

* spelling: modifying

* spelling: nonexistent

* spelling: plumbum

* spelling: programmatically

* spelling: received

* spelling: replaced

* spelling: required

* spelling: sanitizers

* spelling: semicolon

* spelling: source

* spelling: subcommands

* spelling: successful

* Add copyright check

* Remove old license message

* Implement suggestions from code review