Formalizing code module structure and inheritance (Large Commit)

- Commenting cleaned up
- usb_keyboard_debug is not finished yet in terms of cleanup (needs DEBUB_PRINT #ifdef's)
- Added LoadFile script generation
- Formalized KeyIndex and USBKeys data containers
- Split parts of scan_loop into Macro, USB, and main.c
- Added interface to USB modules
- Added interface to Macro modules
- Added proper Debug module enable/disable

USB/pjrc/usb_keyboard_debug.h

@@ -2,15 +2,14 @@
 #define usb_serial_h__
 
 #include <stdint.h>
+#include "usb_com.h"
 
 void usb_init(void);			// initialize everything
 uint8_t usb_configured(void);		// is the USB port configured
 
 int8_t usb_keyboard_press(uint8_t key, uint8_t modifier);
 int8_t usb_keyboard_send(void);
-extern uint8_t keyboard_modifier_keys;
-extern uint8_t keyboard_keys[6];
-extern volatile uint8_t keyboard_leds;
+
 
 int8_t usb_debug_putchar(uint8_t c);	// transmit a character
 void usb_debug_flush_output(void);	// immediately transmit any buffered output