Add support for upcoming Gen7 v1.4

V1.4 moves thermistor power to the always-on 5v line.
The BOGUS_TEMPERATURE_FAILSAFE_OVERRIDE is no longer
needed on this board.  Add a new motherboard type to
support this feature.

Marlin/Configuration.h

 // Gen7 custom (Alfons3 Version) = 10 "https://github.com/Alfons3/Generation_7_Electronics"
 // Gen7 v1.1, v1.2 = 11
 // Gen7 v1.3 = 12
+// Gen7 v1.4 = 13
 // MEGA/RAMPS up to 1.2 = 3
 // RAMPS 1.3 = 33 (Power outputs: Extruder, Bed, Fan)
 // RAMPS 1.3 = 34 (Power outputs: Extruder0, Extruder1, Bed)

Marlin/pins.h

 #endif /* 99 */
 
 /****************************************************************************************
-* Gen7 v1.1, v1.2, v1.3 pin assignment
+* Gen7 v1.1, v1.2, v1.3, v1.4 pin assignment
 *
 ****************************************************************************************/
 
+
+#if MOTHERBOARD == 13
+#define MOTHERBOARD 11
+#define GEN7_VERSION 14 // v1.4
+#endif
+
 #if MOTHERBOARD == 12
 #define MOTHERBOARD 11
-#define GEN7_V_1_3
+#define GEN7_VERSION 13 // v1.3
 #endif
 
 #if MOTHERBOARD == 11
 
 #endif
 
+#ifndef GEN7_VERSION
+#define GEN7_VERSION 12 // v1.x
+#endif
+
 //x axis pins
 #define X_STEP_PIN 19
 #define X_DIR_PIN 18
 #define SDSS -1 // SCL pin of I2C header
 #define LED_PIN -1
 
-#ifdef GEN7_V_1_3
+#if (GEN7_VERSION >= 13)
 // Gen7 v1.3 removed the fan pin
 #define FAN_PIN -1
 #else
 #endif
 #define PS_ON_PIN 15
 
+#if (GEN7_VERSION < 14)
 // Gen 1.3 and earlier supplied thermistor power via PS_ON
 // Need to ignore the bad thermistor readings on those units
 #define BOGUS_TEMPERATURE_FAILSAFE_OVERRIDE
+#endif
+
 //our pin for debugging.
 #define DEBUG_PIN 0