Allow save of uStep resolution with M500 #1658
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…which is persisted during M500 for Mk3 and Mk3S
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Allow saving of the micro-stepping resolution to EPROM using the M500 command.
Changing this setting is useful for folks who are running geared extruders like skelestruder with a motor that requires a very high number of esteps such as the LDO pancake 0.9° stepper.
At the moment changing the e axis resolution requires a recompile of the firmware. With this change, a user can run an "M350 Exxx" command to set the resolution for the e axis and then run an M500 to persist the changes.