From #9914 by @Sebastianv650

Fix #9477

See https://github.com/MarlinFirmware/Marlin/issues/9852#issuecomment-369861822

Followup to #9008

- Don't define micro-stepping pins for boards that lack them.
- Allow setting of 128 microsteps with `M350`.

Fix #9906

Fix display of analog input value.

The updated planner takes the length of the move, so this pre-calculation is no longer needed.

Manual moves now correctly include the workspace offset.

Fix #9851

Followup to #9835

From #9849