Universal support for draw_circuit_wires / draw_copper_wires

[Therax]

My mods use a bunch of hidden entities, including inserters, chests, etc. I frequently circuit connect them to each other via scripting, i.e. to use multiple inserters which are ganged together to react simultaneously to changing signals. Currently I arrange for the circuit connection points to all overlap each other, but that still results in an unsightly red/green pixel rendered on top of everything else. I'd like to suppress the drawing of the circuit wires entirely, as is already possible with electric poles.

[Rseding91]

I'll see about adding it in.