Use _PIN suffix on some pins

Marlin/SanityCheck.h

@@ -61,10 +61,6 @@
   #error "Z_LATE_ENABLE can't be used with COREXZ."
 #elif defined(X_HOME_RETRACT_MM)
   #error "[XYZ]_HOME_RETRACT_MM settings have been renamed [XYZ]_HOME_BUMP_MM."
-#elif defined(BEEPER)
-  #error "BEEPER is now BEEPER_PIN. Please update your pins definitions."
-#elif defined(SDCARDDETECT)
-  #error "SDCARDDETECT is now SD_DETECT_PIN. Please update your pins definitions."
 #elif defined(SDCARDDETECTINVERTED)
   #error "SDCARDDETECTINVERTED is now SD_DETECT_INVERTED. Please update your configuration."
 #elif defined(BTENABLED)
@@ -143,6 +139,16 @@
   #error "SCARA is now MORGAN_SCARA. Please update your configuration."
 #elif defined(AUTO_BED_LEVELING_GRID_POINTS)
   #error "AUTO_BED_LEVELING_GRID_POINTS is now ABL_GRID_POINTS_X and ABL_GRID_POINTS_Y. Please update your configuration."
+#elif defined(BEEPER)
+  #error "BEEPER is now BEEPER_PIN. Please update your pins definitions."
+#elif defined(SDCARDDETECT)
+  #error "SDCARDDETECT is now SD_DETECT_PIN. Please update your pins definitions."
+#elif defined(STAT_LED_RED) || defined(STAT_LED_BLUE)
+  #error "STAT_LED_RED/STAT_LED_BLUE are now STAT_LED_RED_PIN/STAT_LED_BLUE_PIN. Please update your pins definitions."
+#elif defined(LCD_PIN_BL)
+  #error "LCD_PIN_BL is now LCD_BACKLIGHT_PIN. Please update your pins definitions."
+#elif defined(LCD_PIN_RESET)
+  #error "LCD_PIN_RESET is now LCD_RESET_PIN. Please update your pins definitions."
 #endif
 
 /**

Marlin/pins_MEGACONTROLLER.h

@@ -134,7 +134,7 @@
   // Pins for DOGM SPI LCD Support
   #define DOGLCD_A0        47
   #define DOGLCD_CS        45
-  #define LCD_PIN_BL       44  // backlight LED on PA3
+  #define LCD_BACKLIGHT_PIN 44  // backlight LED on PA3
 
   #define KILL_PIN         12
   // GLCD features

Marlin/pins_RAMPS.h

@@ -240,7 +240,7 @@
       #define KILL_PIN 41
 
       #if ENABLED(BQ_LCD_SMART_CONTROLLER)
-        #define LCD_PIN_BL 39
+        #define LCD_BACKLIGHT_PIN 39
       #endif
 
     #elif ENABLED(REPRAPWORLD_GRAPHICAL_LCD)
@@ -293,13 +293,13 @@
       #define BEEPER_PIN 23
       #define DOGLCD_CS 29
       #define DOGLCD_A0 27
-      #define LCD_PIN_BL 33
+      #define LCD_BACKLIGHT_PIN 33
     #elif ENABLED(MINIPANEL)
       #define BEEPER_PIN 42
       // Pins for DOGM SPI LCD Support
       #define DOGLCD_A0  44
       #define DOGLCD_CS  66
-      #define LCD_PIN_BL 65 // backlight LED on A11/D65
+      #define LCD_BACKLIGHT_PIN 65 // backlight LED on A11/D65
       #define SDSS   53
 
       #define KILL_PIN 64

Marlin/pins_SANGUINOLOLU_11.h

@@ -56,7 +56,7 @@
 #if IS_MELZI
   #define LED_PIN          27 // On some broken versions of the Sanguino libraries the pin definitions are wrong, so LED_PIN needs to be 28. But you should upgrade your Sanguino libraries! See #368.
 #elif MB(STB_11)
-  #define LCD_PIN_BL       17 // LCD backlight LED
+  #define LCD_BACKLIGHT_PIN 17 // LCD backlight LED
 #endif
 
 #if ENABLED(Z_PROBE_SLED)
@@ -173,7 +173,7 @@
   // Pins for DOGM SPI LCD Support
   #define DOGLCD_A0             30
   #define DOGLCD_CS             17
-  #define LCD_PIN_BL            28 // backlight LED on PA3
+  #define LCD_BACKLIGHT_PIN     28 // backlight LED on PA3
   // GLCD features
   #define LCD_CONTRAST           1
   // Uncomment screen orientation

Marlin/ultralcd_impl_DOGM.h

@@ -220,14 +220,14 @@ void lcd_printPGM(const char* str) {
 // Initialize or re-initializw the LCD
 static void lcd_implementation_init() {
 
-  #if defined(LCD_PIN_BL) && LCD_PIN_BL > -1 // Enable LCD backlight
+  #if PIN_EXISTS(LCD_BACKLIGHT) // Enable LCD backlight
-    pinMode(LCD_PIN_BL, OUTPUT);
+    pinMode(LCD_BACKLIGHT_PIN, OUTPUT);
-    digitalWrite(LCD_PIN_BL, HIGH);
+    digitalWrite(LCD_BACKLIGHT_PIN, HIGH);
   #endif
 
-  #if defined(LCD_PIN_RESET) && LCD_PIN_RESET > -1
+  #if PIN_EXISTS(LCD_RESET)
-    pinMode(LCD_PIN_RESET, OUTPUT);
+    pinMode(LCD_RESET_PIN, OUTPUT);
-    digitalWrite(LCD_PIN_RESET, HIGH);
+    digitalWrite(LCD_RESET_PIN, HIGH);
   #endif
 
   #if DISABLED(MINIPANEL) // setContrast not working for Mini Panel