Implement M0/M1 for EMERGENCY_PARSER

Marlin/Marlin.h

@@ -266,6 +266,10 @@ extern bool axis_known_position[XYZ]; // axis[n].is_known
 extern bool axis_homed[XYZ]; // axis[n].is_homed
 extern volatile bool wait_for_heatup;
 
+#if ENABLED(EMERGENCY_PARSER) && DISABLED(ULTIPANEL)
+  extern volatile bool wait_for_user;
+#endif
+
 extern float current_position[NUM_AXIS];
 extern float position_shift[XYZ];
 extern float home_offset[XYZ];