Overhaul of the planner (#11578)

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

Marlin/src/gcode/calibrate/M852.cpp

@@ -87,7 +87,7 @@ void GcodeSuite::M852() {
   // When skew is changed the current position changes
   if (setval) {
     set_current_from_steppers_for_axis(ALL_AXES);
-    SYNC_PLAN_POSITION_KINEMATIC();
+    sync_plan_position();
     report_current_position();
   }