Moved LCD initialization out of constructor

Since the class "MainMenu" was used within a static variable the
initialization of the object (constructor call) was done before Arduino
library startup. It always caused a crash when using AVRStudio with
JTAG debugger (caused from calling the LCD initialization / the lot of
I/O work / the stack used during this calls). By moving the LCD_INIT
out of the constructor and using an explicit call inside of Arduino
setup() implementation immediately fixed all problems and the JTAG
debugger runs fine.

Marlin/ultralcd.h

@@ -134,11 +134,12 @@
   char *ftostr3(const float &x);
 
 
-
+  #define LCD_INIT lcd_init();
   #define LCD_MESSAGE(x) lcd_status(x);
   #define LCD_MESSAGEPGM(x) lcd_statuspgm(MYPGM(x));
   #define LCD_STATUS lcd_status()
 #else //no lcd
+  #define LCD_INIT
   #define LCD_STATUS
   #define LCD_MESSAGE(x)
   #define LCD_MESSAGEPGM(x)