This is currently marked breaking (fix!:) but it doesn't functionally change usage, only the usage printing is changed, whether that is breaking is a bit subjective 🤔

This PR changes the argument usage text for boolean arguments:

• Normal usage is always printed and uses description
• Print negative usage when either
  • Argument is enabled by default
  • negativeDescription is defined (not empty)
• Do not print negative usage when
  • Argument name starts with negative prefix, either no- or no[A-Z]
• Negative usage description prints negativeDescription or empty text

Resolves #176
(FYI, I have changed the issue scope slightly)