CRAFTBOOK-3133 - Reported by pilotkip

This is a request for an Craftbook IC sign to implement a Radio Button type selector. Namely, the sign could be 3I3O. When any input goes high, the corresponding output goes high and all other outputs go low. When all inputs are low, or more than one input is high, no change is made to the output. It's exactly like the 'select' used on web pages where users can pick one option. This would be very useful when using buttons to select a circuit to be active, such as for track selection or micro game choices.