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/host/M114.cpp

@@ -56,7 +56,7 @@
 
     float leveled[XYZ] = { current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS] };
 
-    #if PLANNER_LEVELING
+    #if HAS_LEVELING
       SERIAL_PROTOCOLPGM("Leveled:");
       planner.apply_leveling(leveled);
       report_xyz(leveled);