Move G42 to cpp

Marlin/src/Marlin.cpp

  ***************** GCode Handlers *****************
  **************************************************/
 
-#if HAS_MESH
-  #include "gcode/probe/G42.h"
-#endif
-
 #include "gcode/geometry/G92.h"
 
 #if HAS_RESUME_CONTINUE

Marlin/src/gcode/probe/G42.h → Marlin/src/gcode/bedlevel/G42.cpp

  *
  */
 
+#include "../../inc/MarlinConfig.h"
+
+#if HAS_MESH
+
+#include "../gcode.h"
+#include "../../Marlin.h" // for IsRunning()
+#include "../../module/motion.h"
+#include "../../feature/bedlevel/bedlevel.h"
+
 /**
  * G42: Move X & Y axes to mesh coordinates (I & J)
  */
-void gcode_G42() {
+void GcodeSuite::G42() {
   if (IsRunning()) {
     const bool hasI = parser.seenval('I');
     const int8_t ix = hasI ? parser.value_int() : 0;
     #endif
   }
 }
+
+#endif // HAS_MESH

Marlin/src/gcode/gcode.cpp

 //
 // Placeholders for non-migrated codes
 //
-extern void gcode_G42();
 extern void gcode_G92();
 extern void gcode_M0_M1();
 extern void gcode_M3_M4(bool is_M3);
         break;
 
       #if HAS_MESH
-        case 42:
-          gcode_G42();
-          break;
+        case 42: G42(); break;        // G42: Coordinated move to a mesh point
       #endif
 
       #if ENABLED(DEBUG_GCODE_PARSER)

Marlin/src/gcode/gcode.h

  * G32  - Undock sled (Z_PROBE_SLED only)
  * G33  - Delta Auto-Calibration (Requires DELTA_AUTO_CALIBRATION)
  * G38  - Probe in any direction using the Z_MIN_PROBE (Requires G38_PROBE_TARGET)
- * G42  - Coordinated move to a mesh point (Requires AUTO_BED_LEVELING_UBL)
+ * G42  - Coordinated move to a mesh point (Requires HAS_MESH)
  * G90  - Use Absolute Coordinates
  * G91  - Use Relative Coordinates
  * G92  - Set current position to coordinates given