Diabase crash detector

This thing can be used to mount the heatbed of the Diabase H-series on springs and to mount switches underneath the printbed to detect when a nozzle has crashed into the bed. This is usefull since the diabase H-series is so powerfull it will bend it's extruders before the motors stall, even when software stall detection (M915) is enabled. Note that this solution probably only works when you are not using the machine for milling and that you will loose the capability to easily take of the heatbed