Added Fan control to the pre-heat settings.

I find that the PID routine works better when the cooling fan is switched on
at the beginning of a warm up routine.  Otherwise when you enable the fan
just before a print, you have a delay as the PIDre-adjusts.

This should also be safer as most cooling fans are directed at the hot -ends
thermal barrier!

Marlin/Configuration.h

@@ -194,10 +194,16 @@ const bool Z_ENDSTOPS_INVERTING = false; // set to true to invert the logic of t
   #define ULTRA_LCD
   #define LCD_WIDTH 20
   #define LCD_HEIGHT 4
+
+// Preheat Constants
   #define PLA_PREHEAT_HOTEND_TEMP 180 
   #define PLA_PREHEAT_HPB_TEMP 70
+  #define PLA_PREHEAT_FAN_SPEED 255		// Insert Value between 0 and 255
+
   #define ABS_PREHEAT_HOTEND_TEMP 240
   #define ABS_PREHEAT_HPB_TEMP 100
+  #define ABS_PREHEAT_FAN_SPEED 255		// Insert Value between 0 and 255
+
 #else //no panel but just lcd 
   #ifdef ULTRA_LCD
     #define LCD_WIDTH 16