lowercase "stop" function

Marlin/Marlin.h

 void reset_bed_level();
 void prepare_move();
 void kill(const char*);
-void Stop();
 
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   void handle_filament_runout();

Marlin/Marlin_main.cpp

  * ***************************************************************************
  */
 
+void stop();
+
 void get_available_commands();
 void process_next_command();
 
             SERIAL_ERRORLNPGM("Z-Probe failed to engage!");
             LCD_ALERTMESSAGEPGM("Err: ZPROBE");
           }
-          Stop();
+          stop();
         }
 
     #endif // Z_PROBE_ALLEN_KEY
             SERIAL_ERRORLNPGM("Z-Probe failed to retract!");
             LCD_ALERTMESSAGEPGM("Err: ZPROBE");
           }
-          Stop();
+          stop();
         }
     #endif // Z_PROBE_ALLEN_KEY
 
   }
 #endif // FAST_PWM_FAN
 
-void Stop() {
+void stop() {
   disable_all_heaters();
   if (IsRunning()) {
     Running = false;