Add option for centerline guidelines to artboard panel "guidelines" section

[Boldline]

I'd love to see a quick option added to the artboard panel for centerline guides to be added to the artboard. Automatic vertical and horizontal centered lines.

Illustrator has a similar option, but they just offer to put a dot in the center... this would not be as useful in my opinion.

[VectorStyler]

@Boldline Added this to the backlog.