Options category #144

Currently, this is the general output of the help command:

image

Specific output of help for a command is similar.

I wonder if we want to add category slot to the option type. That way, we could sort options by categories instead of just alphabetically. We could also separate categories with an extra blank line.

It would be a nice addition. Not so much for our own, but for users. I think it's an improvement without downsides, as long as that slot has a default which is to be empty. If any user needs it, they can use it to provide a more organized interface.

Of course, we will use it too :)