Implement HAL and apply macros across code-base

Implement AVR Platform

Marlin/Marlin.h

@@ -28,20 +28,15 @@
 #include <string.h>
 #include <inttypes.h>
 
-#include <util/delay.h>
-#include <avr/pgmspace.h>
-#include <avr/eeprom.h>
-#include <avr/interrupt.h>
-
 #include "MarlinConfig.h"
 
 #ifdef DEBUG_GCODE_PARSER
   #include "gcode.h"
 #endif
+#include "src/HAL/HAL.h"
 
 #include "enum.h"
 #include "types.h"
-#include "fastio.h"
 #include "utility.h"
 #include "serial.h"