Support counting of bool/flag variables

[lunim]

I am looking to get a count of a specific flag. For example, I would like to support the ability to specific -v, -vv, -vvv (etc) and get a count of that.

I have tried to specify the following, but this is not supported:

[Option("-v", "Verbose", CommandOptionType.NoValue)] public bool[] Verbose { get; }

[Option("-v", "Verbose", CommandOptionType.MultipleValue)] public int Verbose { get; }

[natemcmaster]

I'd accept a PR for this.

[natemcmaster]

Usage:

[Option("-v", "Verbose")] public bool[] Verbose { get; }

You should be able to use Verbose.Length to see how many times the flag was specified.