Single Z raise value for all tool-changing / parking (#12090)

* Universal tool-change Z lift
* Add TOOLCHANGE_ZRAISE to example configs
* Park/unpark changes to example configs
* Implement DEBUG_DXC_MODE

Marlin/src/config/examples/RepRapPro/Huxley/Configuration.h

@@ -161,7 +161,6 @@
   #define SINGLENOZZLE_SWAP_RETRACT_SPEED 3600  // (mm/m)
   #define SINGLENOZZLE_SWAP_PRIME_SPEED   3600  // (mm/m)
   //#define SINGLENOZZLE_SWAP_PARK
-  #define SINGLENOZZLE_TOOLCHANGE_ZRAISE     2  // (mm)
   #if ENABLED(SINGLENOZZLE_SWAP_PARK)
     #define SINGLENOZZLE_TOOLCHANGE_XY    { X_MIN_POS + 10, Y_MIN_POS + 10 }
     #define SINGLENOZZLE_PARK_XY_FEEDRATE 6000  // (mm/m)
@@ -215,7 +214,6 @@
   #define PARKING_EXTRUDER_SOLENOIDS_DELAY 250        // Delay (ms) for magnetic field. No delay if 0 or not defined.
   #define PARKING_EXTRUDER_PARKING_X { -78, 184 }     // X positions for parking the extruders
   #define PARKING_EXTRUDER_GRAB_DISTANCE 1            // mm to move beyond the parking point to grab the extruder
-  #define PARKING_EXTRUDER_SECURITY_RAISE 5           // Z-raise before parking
   //#define MANUAL_SOLENOID_CONTROL                   // Manual control of docking solenoids with M380 S / M381
 #endif
 
@@ -233,7 +231,6 @@
   #define SWITCHING_TOOLHEAD_Y_SECURITY    10         // (mm) Security distance Y axis
   #define SWITCHING_TOOLHEAD_Y_CLEAR       60         // (mm) Minimum distance from dock for unobstructed X axis
   #define SWITCHING_TOOLHEAD_X_POS        { 215, 0 }  // (mm) X positions for parking the extruders
-  #define SWITCHING_TOOLHEAD_SECURITY_RAISE 5         // (mm) Z-raise before parking
 #endif
 
 /**
@@ -991,6 +988,9 @@ Black rubber belt(MXL), 18 - tooth aluminium pulley : 87.489 step per mm (Huxley
 #define Y_MAX_POS Y_BED_SIZE
 #define Z_MAX_POS 80
 
+// Z raise distance for tool-change, as needed for some extruders
+#define TOOLCHANGE_ZRAISE     2  // (mm)
+
 /**
  * Software Endstops
  *