Drop redundant "simulator.h" includes.

simulator.h is already included in config.h/arduino.h, so it doesn't
need to be included again most of the time. In some cases it was
included twice on purpose to undo some intervening include file, but
these intervening includes were unnecessary. Remove some related
include file redundancy by re-ordering the include files and relocating
some nested includes up to the parent .c file.

gcode_parse.c

@@ -14,9 +14,6 @@
 #include	"sersendf.h"
 
 #include	"gcode_process.h"
-#ifdef SIMULATOR
-  #include "simulator.h"
-#endif
 
 
 /** Bitfield for available sources of G-code.

heater.h

@@ -3,7 +3,6 @@
 
 #include "config_wrapper.h"
 #include	<stdint.h>
-#include "simulator.h"
 #include "temp.h"
 
 /// Default scaled P factor, equivalent to 8.0 counts/qC or 32 counts/C.

mendel.c

@@ -46,7 +46,6 @@
 #include "spi.h"
 #include "sd.h"
 #include "display.h"
-#include "simulator.h"
 
 #ifdef SIMINFO
   #include "../simulavr/src/simulavr_info.h"

serial.h

@@ -3,7 +3,7 @@
 
 #include "config_wrapper.h"
 #include	<stdint.h>
-#include "simulator.h"
+
 
 #ifdef USB_SERIAL
   #include "usb_serial.h"

usb_serial.c

@@ -32,7 +32,6 @@
 // 2012-10-17: Import to Teacup firmware
 
 #include "config_wrapper.h"
-#include "simulator.h"
 
 /* protect this file from Arduino IDE */
 #ifdef USB_SERIAL