Some probes don't work near the edges of the bed. This change promotes MIN_PROBE_EDGE to a general setting that applies to all probing functions.

Some "fix-mounted" probes need manual stowing. And after probing some may prefer to raise or lower the nozzle. This restores an old option but tailors it to allow raise or lower as preferred.

- `M666` is static, not inline
- Disambiguate some stepper macros

Reference #9983

With this option enabled, Z won't ever be raised until after `G28` has been completed, and it won't raise if Z becomes unknown. This is good for machines whose beds fall when Z is powered off.

…and limit the raise to Z_MAX_POS

Fix #10029

Fix #10029

Fixes #9939

Fix #9948

A capital idea from https://github.com/MarlinFirmware/Marlin/pull/9914#issuecomment-371614153

Previously `position_is_reachable_by_probe` was limited to the area specified for `G29` mesh leveling (even if leveling was disabled). This change will properly consider the entire bed area so that `G30` and other non-leveling probing may take place.

Fix #10004

Followup to #9985

Missed in the original LA 1.5 PR: eISR has to use a local copy of
current_block->use_advance_lead because it might still run wenn the last
block has been set to NULL.

From #9914 by @Sebastianv650

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

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

nextAdvanceISR is set in the next if structure in every possible
situation, so it's useless to set it once more before.

In reference to #9633

Removal of obsolete (i) from port of LIN_ADVANCE from V1.1.x to V2..0.x.

Fix #9732