Allow roboport supply/construction range to be limited

[thereaverofdarkness]

Suggestion: give roboports an option in their GUI which allows players to limit their supply or construction radius to an amount smaller than the base value.

I was building my wall when I noticed that roboports would construct portions of the wall much further than they would supply them. I want to enable my gun turrets to receive ammo via requester chests, but I don't want robots to come slowly all the way from the other end of my base when I do construction/deconstruction just outside my wall because I'd rather have my personal robots do that, and I don't want robots coming out to repair me when I'm doing combat near my wall. If I could limit my roboport's construction radius to something only slightly bigger than the supply radius, I would be a lot happier.