Rename BEEPER to BEEPER_PIN

For consistency with other pins, allowing use of `PIN_EXISTS` macro.

Marlin/pins_GEN7_CUSTOM.h

 #define X_STEP_PIN      21                  // different from standard GEN7
 #define X_DIR_PIN       20                  // different from standard GEN7
 #define X_ENABLE_PIN    24
-#define X_STOP_PIN      0
+#define X_STOP_PIN       0
 
 //y axis pins
 #define Y_STEP_PIN      23
 #define Y_DIR_PIN       22
 #define Y_ENABLE_PIN    24
-#define Y_STOP_PIN      1
+#define Y_STOP_PIN       1
 
 //z axis pins
 #define Z_STEP_PIN      26
 #define Z_DIR_PIN       25
 #define Z_ENABLE_PIN    24
-#define Z_STOP_PIN      2
+#define Z_STOP_PIN       2
 
 //extruder pins
 #define E0_STEP_PIN     28
 #define E0_DIR_PIN      27
 #define E0_ENABLE_PIN   24
 
-#define TEMP_0_PIN      2
+#define TEMP_0_PIN       2
 #define TEMP_1_PIN      -1
 #define TEMP_2_PIN      -1
-#define TEMP_BED_PIN    1   // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!! (pin 34 bed)
+#define TEMP_BED_PIN     1   // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!! (pin 34 bed)
 
-#define HEATER_0_PIN    4
+#define HEATER_0_PIN     4
 #define HEATER_1_PIN    -1
 #define HEATER_2_PIN    -1
-#define HEATER_BED_PIN  3  // (bed)
+#define HEATER_BED_PIN   3  // (bed)
 
 #define SDPOWER         -1
 #define SDSS            31                  // SCL pin of I2C header || CS Pin for SD Card support
 //#define TX_ENABLE_PIN       12
 //#define RX_ENABLE_PIN       13
 
-#define BEEPER_PIN -1
-#define SD_DETECT_PIN -1
-#define SUICIDE_PIN -1    //has to be defined; otherwise Power_off doesn't work
+#define BEEPER_PIN       -1
+#define SD_DETECT_PIN    -1
+#define SUICIDE_PIN      -1    //has to be defined; otherwise Power_off doesn't work
 
 #define KILL_PIN -1
 //Pins for 4bit LCD Support

Marlin/pins_OMCA_A.h

 #define X_STEP_PIN         21
 #define X_DIR_PIN          20
 #define X_ENABLE_PIN       24
-#define X_STOP_PIN         0
+#define X_STOP_PIN          0
 
 #define Y_STEP_PIN         23
 #define Y_DIR_PIN          22
 #define Y_ENABLE_PIN       24
-#define Y_STOP_PIN         1
+#define Y_STOP_PIN          1
 
 #define Z_STEP_PIN         26
 #define Z_DIR_PIN          25
 #define Z_ENABLE_PIN       24
-#define Z_STOP_PIN         2
+#define Z_STOP_PIN          2
 
-#define E0_STEP_PIN         28
-#define E0_DIR_PIN          27
-#define E0_ENABLE_PIN       24
+#define E0_STEP_PIN        28
+#define E0_DIR_PIN         27
+#define E0_ENABLE_PIN      24
 
-#define E1_STEP_PIN         -1 // 19
-#define E1_DIR_PIN          -1 // 18
-#define E1_ENABLE_PIN       24
+#define E1_STEP_PIN        -1 // 19
+#define E1_DIR_PIN         -1 // 18
+#define E1_ENABLE_PIN      24
 
-#define E2_STEP_PIN         -1 // 17
-#define E2_DIR_PIN          -1 // 16
-#define E2_ENABLE_PIN       24
+#define E2_STEP_PIN        -1 // 17
+#define E2_DIR_PIN         -1 // 16
+#define E2_ENABLE_PIN      24
 
 #define SDPOWER            -1
 #define SDSS               11
 #define SD_DETECT_PIN      -1 // 10 optional also used as mode pin
 #define LED_PIN            -1
-#define FAN_PIN            3
+#define FAN_PIN             3
 #define PS_ON_PIN          -1
 #define KILL_PIN           -1
 
-#define HEATER_0_PIN       4
+#define HEATER_0_PIN        4
 #define HEATER_1_PIN       -1 // 12
 #define HEATER_2_PIN       -1 // 13
 #define TEMP_0_PIN          0 //D27   // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!!

Marlin/pins_RAMPS_13.h

 #if MB(RAMPS_13_EFF) || MB(RAMPS_13_EEF) || MB(RAMPS_13_SF)
   #define HEATER_BED_PIN     -1    // NO BED
 #else
-  #define HEATER_BED_PIN     8    // BED
+  #define HEATER_BED_PIN      8    // BED
 #endif
 
-#define TEMP_BED_PIN       14   // ANALOG NUMBERING
+#define TEMP_BED_PIN         14   // ANALOG NUMBERING
 
 #if HAS_SERVOS
   #define SERVO0_PIN         11
 #endif
 
 #if ENABLED(Z_PROBE_SLED)
-  #define SLED_PIN         -1
+  #define SLED_PIN           -1
 #endif
 
 #if ENABLED(ULTRA_LCD)

Marlin/pins_RUMBA.h

 
 #define LED_PIN            13
 
-#define FAN_PIN            7
-#define FAN1_PIN           8
+#define FAN_PIN             7
+#define FAN1_PIN            8
 
 #define PS_ON_PIN          45
 #define KILL_PIN           46
 
 #if (TEMP_SENSOR_0==0)
-  #define TEMP_0_PIN         -1
-  #define HEATER_0_PIN       -1
+  #define TEMP_0_PIN           -1
+  #define HEATER_0_PIN         -1
 #else
-  #define HEATER_0_PIN        2    // EXTRUDER 1
+  #define HEATER_0_PIN          2   // EXTRUDER 1
   #if (TEMP_SENSOR_0==-1)
-    #define TEMP_0_PIN         6    // ANALOG NUMBERING - connector *K1* on RUMBA thermocouple ADD ON is used
+    #define TEMP_0_PIN          6   // ANALOG NUMBERING - connector *K1* on RUMBA thermocouple ADD ON is used
   #else
     #define TEMP_0_PIN         15   // ANALOG NUMBERING - default connector for thermistor *T0* on rumba board is used
   #endif
 #endif
 
 #if (TEMP_SENSOR_1==0)
-  #define TEMP_1_PIN         -1
-  #define HEATER_1_PIN       -1
+  #define TEMP_1_PIN           -1
+  #define HEATER_1_PIN         -1
 #else
-  #define HEATER_1_PIN        3    // EXTRUDER 2
+  #define HEATER_1_PIN          3   // EXTRUDER 2
   #if (TEMP_SENSOR_1==-1)
-    #define TEMP_1_PIN         5    // ANALOG NUMBERING - connector *K2* on RUMBA thermocouple ADD ON is used
+    #define TEMP_1_PIN          5   // ANALOG NUMBERING - connector *K2* on RUMBA thermocouple ADD ON is used
   #else
     #define TEMP_1_PIN         14   // ANALOG NUMBERING - default connector for thermistor *T1* on rumba board is used
   #endif
 #endif
 
 #if (TEMP_SENSOR_2==0)
-  #define TEMP_2_PIN         -1
-  #define HEATER_2_PIN       -1
+  #define TEMP_2_PIN          -1
+  #define HEATER_2_PIN        -1
 #else
-  #define HEATER_2_PIN        6    // EXTRUDER 3
+  #define HEATER_2_PIN         6    // EXTRUDER 3
   #if (TEMP_SENSOR_2==-1)
     #define TEMP_2_PIN         7    // ANALOG NUMBERING - connector *K3* on RUMBA thermocouple ADD ON is used <-- this can not be used when TEMP_SENSOR_BED is defined as thermocouple
   #else
 //optional FAN1 can be used as 4th heater output: #define HEATER_3_PIN       8    // EXTRUDER 4
 
 #if (TEMP_SENSOR_BED==0)
-  #define TEMP_BED_PIN       -1
-  #define HEATER_BED_PIN     -1
+  #define TEMP_BED_PIN        -1
+  #define HEATER_BED_PIN      -1
 #else
-  #define HEATER_BED_PIN      9    // BED
+  #define HEATER_BED_PIN       9    // BED
   #if (TEMP_SENSOR_BED==-1)
     #define TEMP_BED_PIN       7    // ANALOG NUMBERING - connector *K3* on RUMBA thermocouple ADD ON is used <-- this can not be used when TEMP_SENSOR_2 is defined as thermocouple
   #else
-    #define TEMP_BED_PIN       11   // ANALOG NUMBERING - default connector for thermistor *THB* on rumba board is used
+    #define TEMP_BED_PIN      11    // ANALOG NUMBERING - default connector for thermistor *THB* on rumba board is used
   #endif
 #endif