- Move FWRETRACT to the planner
- Combine leveling, skew, etc. in a single modifier method
- Have kinematic and non-kinematic moves call one planner method

There's no reason for G28 to reset DUAL_NOZZLE_DUPLICATION_MODE, because it only affects the E stepper, unlike DUAL_X_CARRIAGE which affects the X steppers as well.

Added reset bltouch instead. This ensure properly stow even when in error.

Use macros that explicitly avoid double-evaluation and can be used for any datatype, replacing `min`, `max`, `abs`, `fabs`, `labs`, and `FABS`.

Co-Authored-By: ejtagle <ejtagle@hotmail.com>

Co-Authored-By: ejtagle <ejtagle@hotmail.com>

Fix #10476

* Remove obsolete strings
* Tweak some static consts
* Reset LCD status to fallbacks

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

Followup to d6df032

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.