Added some stationary states to the multiplexer and demultiplexer
Fix doors doubling their mass when melting
Updated artwork for the three Conveyor sensors
Changed the OFF state in the Not gate to have no red or green coming into it (white lines and input output) and added some glow to the input and outputs when it's receiving signals
Added Ribbon Bridge to the build menu
Hook up new NOT Gate art.
Hook up strings for Automation Ribbon Bridge.