Move M3-M5 to cpp

Marlin/src/Marlin.cpp

  ***************** GCode Handlers *****************
  **************************************************/
 
-#if ENABLED(SPINDLE_LASER_ENABLE)
-  #include "gcode/control/M3-M5.h"
-#endif
-
 #include "gcode/control/M17.h"
 
 #if ENABLED(ADVANCED_PAUSE_FEATURE)

Marlin/src/gcode/control/M3-M5.h → Marlin/src/gcode/control/M3-M5.cpp

  *
  */
 
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(SPINDLE_LASER_ENABLE)
+
+#include "../gcode.h"
+#include "../../module/stepper.h"
+
 /**
  * M3: Spindle Clockwise
  * M4: Spindle Counter-clockwise
   analogWrite(SPINDLE_LASER_PWM_PIN, spindle_laser_power);
 }
 
-void gcode_M3_M4(bool is_M3) {
+void GcodeSuite::M3_M4(bool is_M3) {
 
   stepper.synchronize();   // wait until previous movement commands (G0/G0/G2/G3) have completed before playing with the spindle
   #if SPINDLE_DIR_CHANGE
 }
 
 /**
-* M5 turn off spindle
-*/
-void gcode_M5() {
+ * M5 turn off spindle
+ */
+void GcodeSuite::M5() {
   stepper.synchronize();
   WRITE(SPINDLE_LASER_ENABLE_PIN, !SPINDLE_LASER_ENABLE_INVERT);
   delay_for_power_down();
 }
+
+#endif // SPINDLE_LASER_ENABLE

Marlin/src/gcode/gcode.cpp

 //
 // Placeholders for non-migrated codes
 //
-extern void gcode_M3_M4(bool is_M3);
-extern void gcode_M5();
 extern void gcode_M17();
 extern void gcode_M18_M84();
 extern void gcode_M20();
       #endif // ULTIPANEL
 
       #if ENABLED(SPINDLE_LASER_ENABLE)
-        case 3:
-          gcode_M3_M4(true);   // M3: turn spindle/laser on, set laser/spindle power/speed, set rotation direction CW
-          break;               // synchronizes with movement commands
-        case 4:
-          gcode_M3_M4(false);  // M4: turn spindle/laser on, set laser/spindle power/speed, set rotation direction CCW
-          break;               // synchronizes with movement commands
-        case 5:
-          gcode_M5();     // M5 - turn spindle/laser off
-          break;          // synchronizes with movement commands
+        // These synchronize with movement commands...
+        case 3: M3_M4(true ); break;  // M3: turn spindle/laser on, set laser/spindle power/speed, set rotation direction CW
+        case 4: M3_M4(false); break;  // M4: turn spindle/laser on, set laser/spindle power/speed, set rotation direction CCW
+        case 5: M5(); break;          // M5 - turn spindle/laser off
       #endif
+
       case 17: // M17: Enable all stepper motors
         gcode_M17();
         break;