Merge pull request #1941 from thinkyhead/gcode_M410

Add M410 QuickStop command

Marlin/Marlin_main.cpp

  * M405 - Turn on Filament Sensor extrusion control.  Optional D<delay in cm> to set delay in centimeters between sensor and extruder
  * M406 - Turn off Filament Sensor extrusion control
  * M407 - Display measured filament diameter
+ * M410 - Quickstop. Abort all the planned moves
  * M500 - Store parameters in EEPROM
  * M501 - Read parameters from EEPROM (if you need reset them after you changed them temporarily).
  * M502 - Revert to the default "factory settings". You still need to store them in EEPROM afterwards if you want to.
 #endif // FILAMENT_SENSOR
 
 /**
+ * M410: Quickstop - Abort all planned moves
+ *
+ * This will stop the carriages mid-move, so most likely they
+ * will be out of sync with the stepper position after this.
+ */
+inline void gcode_M410() { quickStop(); }
+
+/**
  * M500: Store settings in EEPROM
  */
 inline void gcode_M500() {
           break;
       #endif // FILAMENT_SENSOR
 
+      case 410: // M410 quickstop - Abort all the planned moves.
+        gcode_M410();
+        break;
+
       case 500: // M500 Store settings in EEPROM
         gcode_M500();
         break;