Assign the index (Z) pulse to an endstop

[LindsayC]

Be able to assign the index (channel Z) output of quadrature encoder plugged into a 1HCL into the normal encoder input as an endstop.

This would allow homing to a defined place on the encoder itself. It does work if you actually plug the index channel output into a normal endstop input on the board with a separate plug but it makes sense for a single plug solution and potentially allows for both homing and counting full rotations together in the future.