Add a configuration setting to disable capitalisation of option value placeholders in help output

The option value placeholders in the help text are always capitalised.

e.g.

[CommandOption("-d <ItemDescription>")]

produces the following option text in the help output

-d <ITEMDESCRIPTION> 

This appears to be the line of code which does this: TemplateParser.cs#L133

I would like there to be a configuration setting to disable this - as I prefer the help option to be as follows

-d <ItemDescription> 

Please upvote :+1: this issue if you are interested in it.