* work on the flags book chapter and making sure the values are initialized properly.
* Fix initialization of values used in flags or options
* update some formatting and more brace initialization
* update more formatting and fix a incorrect initializer
* more formatting and some error fixes
* more formatting
* Small formatting fix
Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>
* some tweaks with optional
* remove set_results function that was bypassing some of the result processing in some cases of config files.
* add positional Validator example and tests add CLI::Number validator.
* add positional Validator example and tests add CLI::Number validator.
* do some reformatting for style checks and remove auto in test lambda.
