Constant combinator on/off status visual indicator

[TheWetFish]

Suggest adding a visual indicator to the constant combinator to indicate the on or off status of the entity.

This would be useful when the constant combinator is in use as a manual button to trigger something on the circuit network.

This is a visual quality of life improvement covering that specific use case; the basic on/off functionality already exists.

Easier implimentations could include a conditionally coloured light onto the existing art asset while more costly implimentations could involve an animated visual rework, similar in nature to the power switch visuals.

[dimm]

This is already in the game, just connect the combinator to the logical network to see.