Move M18_M84, M85 to cpp

Marlin/src/gcode/control/M18_M84.cpp

@@ -20,14 +20,19 @@
  *
  */
 
+#include "../gcode.h"
+#include "../../Marlin.h" // for stepper_inactive_time
+#include "../../module/stepper.h"
+
 #if ENABLED(AUTO_BED_LEVELING_UBL) && ENABLED(ULTRA_LCD)
-  extern bool defer_return_to_status;
+  #include "../../feature/bedlevel/bedlevel.h"
+  #include "../../lcd/ultralcd.h"
 #endif
 
 /**
  * M18, M84: Disable stepper motors
  */
-void gcode_M18_M84() {
+void GcodeSuite::M18_M84() {
   if (parser.seenval('S')) {
     stepper_inactive_time = parser.value_millis_from_seconds();
   }

Marlin/src/gcode/control/M85.cpp

@@ -20,12 +20,14 @@
  *
  */
 
+#include "../gcode.h"
+#include "../../Marlin.h" // for max_inactive_time
+
 /**
  * M85: Set inactivity shutdown timer with parameter S<seconds>. To disable set zero (default)
  */
-void gcode_M85() {
+void GcodeSuite::M85() {
 
   if (parser.seen('S')) max_inactive_time = parser.value_millis_from_seconds();
 
 }
-

Marlin/src/gcode/gcode.cpp

@@ -116,8 +116,6 @@ void GcodeSuite::dwell(millis_t time) {
 //
 // Placeholders for non-migrated codes
 //
-extern void gcode_M18_M84();
-extern void gcode_M85();
 extern void gcode_M92();
 extern void gcode_M100();
 extern void gcode_M114();
@@ -497,12 +495,9 @@ void GcodeSuite::process_next_command() {
       case 83: M83(); break;      // M83: Set E axis relative mode
 
       case 18: // M18 => M84
-      case 84: // M84: Disable all steppers or set timeout
-        gcode_M18_M84();
-        break;
-      case 85: // M85: Set inactivity stepper shutdown timeout
-        gcode_M85();
-        break;
+      case 84: M18_M84(); break;  // M84: Disable all steppers or set timeout
+      case 85: M85(); break;      // M85: Set inactivity stepper shutdown timeout
+
       case 92: // M92: Set the steps-per-unit for one or more axes
         gcode_M92();
         break;