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

Better encapsulation and considerably reduce stepper jitter

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>

Restore necessary and needed loop termination logic.

…to fit more code on the screen and correct outdated commentary contrasting ABL.

`ENABLED` only works for flag-type options. Floats must use `#ifdef`.

Also remove unused grid slicing function when using UBL segmented.

set_destination_to_current() changed to set_destination_from_current()

set_current_to_destination() changed to set_current_from_destination()