Stepper Brake Support
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Request to add support for Stepper Motors with electromagnetic brakes.
Normally locked, apply 24V power to release the steppers.
Some brakes consume anywhere from 5-15W @ 24VDC, so multiple Z axis steppers could be driven by either an Extruder Heater channel, or a Fan channel.
More likely to be the case with Duex5 expansion boards, since they have more Extruder Heater channels.
Would be nice to be able to assign a Brake channel to an Axis, so that the steppers are locked normally, and unlocked with Z axis movements.
