Circuit improvements

[Factoruser]

(don't want to push too much postings to the next page)

• Add a button "disconnect" to each interface of objects that are connected to a circuit network as another way to cut the line.

• (Circuit) wires might become invisible, just displayed on demand, and maybe with an artificial, circuit-diagram-like look.

• Distinct buildings/objects should be automatically connected to a network, to which adjacent objects are connected. For example lamps, and walls of gates. In this case wall pieces, that are connected over gate objects forming the same gate. I.e. if you build a gate connected to a network the wall pieces left and right from the gate get connected to the same network(s) and maybe even function like being the same piece. Of course also the input/output of one "combinator" with the input/output of another should be connected automatically if they are touching each other.