Make a special welcome message for shipping/service prep

Another request from our Service dept. - the user shall be prevented
from skipping the intro wizard, because otherwise some preset/calibrated
features will look like not done - especially live-z calibration.

And since there are users, who send a machine to service to perform 1st
layer calibration only, they must not omit the Z-calibration at the
start after shipping.

Firmware/Marlin_main.cpp

@@ -756,7 +756,7 @@ static void factory_reset(char level)
 		lang_reset();
 		// Force the "Follow calibration flow" message at the next boot up.
 		calibration_status_store(CALIBRATION_STATUS_Z_CALIBRATION);
-		eeprom_write_byte((uint8_t*)EEPROM_WIZARD_ACTIVE, 1); //run wizard
+		eeprom_write_byte((uint8_t*)EEPROM_WIZARD_ACTIVE, 2); //run wizard
 		farm_mode = false;
 		eeprom_update_byte((uint8_t*)EEPROM_FARM_MODE, farm_mode);
 
@@ -1564,7 +1564,7 @@ void setup()
 	  lcd_show_fullscreen_message_and_wait_P(_i("Old settings found. Default PID, Esteps etc. will be set.")); //if EEPROM version or printer type was changed, inform user that default setting were loaded////MSG_DEFAULT_SETTINGS_LOADED c=20 r=5
 	  Config_StoreSettings();
   }
-  if (eeprom_read_byte((uint8_t*)EEPROM_WIZARD_ACTIVE) == 1) {
+  if (eeprom_read_byte((uint8_t*)EEPROM_WIZARD_ACTIVE) >= 1) {
 	  lcd_wizard(WizState::Run);
   }
   if (eeprom_read_byte((uint8_t*)EEPROM_WIZARD_ACTIVE) == 0) { //dont show calibration status messages if wizard is currently active

Firmware/eeprom.h

@@ -408,7 +408,7 @@ static_assert(sizeof(Sheets) == EEPROM_SHEETS_SIZEOF, "Sizeof(Sheets) is not EEP
 #define EEPROM_POWER_COUNT       (EEPROM_FERROR_COUNT - 1)                      // uint8 (orig EEPROM_UVLO_MESH_BED_LEVELING-17)
 
 #define EEPROM_XYZ_CAL_SKEW (EEPROM_POWER_COUNT - 4)                            // float for skew backup
-#define EEPROM_WIZARD_ACTIVE (EEPROM_XYZ_CAL_SKEW - 1)
+#define EEPROM_WIZARD_ACTIVE (EEPROM_XYZ_CAL_SKEW - 1)                          // 0: wizard not active, 1: wizard active, 2: wizard active without yes/no = forced calibrate Z after shipping/service prep.
 #define EEPROM_BELTSTATUS_X (EEPROM_WIZARD_ACTIVE - 2)                          // uint16
 #define EEPROM_BELTSTATUS_Y (EEPROM_BELTSTATUS_X - 2)                           // uint16
 

Firmware/ultralcd.cpp

@@ -4962,7 +4962,7 @@ void lcd_wizard(WizState state)
 {
     using S = WizState;
 	bool end = false;
-	int wizard_event;
+	int8_t wizard_event;
 	const char *msg = NULL;
 	// Make sure EEPROM_WIZARD_ACTIVE is true if entering using different entry point
 	// other than WizState::Run - it is useful for debugging wizard.
@@ -4986,7 +4986,12 @@ void lcd_wizard(WizState state)
 			// Btw. the flag may even trigger the viper situation on normal start this way and the user won't be able to find out why.			
 			saved_printing = false;
 			
-			wizard_event = lcd_show_multiscreen_message_yes_no_and_wait_P(_i("Hi, I am your Original Prusa i3 printer. Would you like me to guide you through the setup process?"), false, true);////MSG_WIZARD_WELCOME c=20 r=7
+			if( eeprom_read_byte((uint8_t*)EEPROM_WIZARD_ACTIVE)==2){
+				lcd_show_fullscreen_message_and_wait_P(_i("Hi, I am your Original Prusa i3 printer. I will guide you through a short setup process, in which the Z-axis will be calibrated. Then, you will be ready to print."));////MSG_WIZARD_WELCOME_SHIPPING c=20 r=7
+				wizard_event = 1;
+			} else {
+				wizard_event = lcd_show_multiscreen_message_yes_no_and_wait_P(_i("Hi, I am your Original Prusa i3 printer. Would you like me to guide you through the setup process?"), false, true);////MSG_WIZARD_WELCOME c=20 r=7
+			}
 			if (wizard_event) {
 				state = S::Restore;
 				eeprom_update_byte((uint8_t*)EEPROM_WIZARD_ACTIVE, 1);