…ommands with empty name, empty group and with no options and subcommands.

Mark required but not yet configured options as "<REQUIRED>" and not yet configured default options as "" in a commented line in the config file.
Add commentDefaults() to comment default value options in case default_also is true

initialize values

fix clang-tidy issue

style: pre-commit.ci fixes

clean up config documentation and structure ordering

style: pre-commit.ci fixes

add some tests for coverage

style: pre-commit.ci fixes

fix config tests and help usage example