Code re-factor now compiles.

- Added better string handling and canned messages
- Added LED error function
- Moved code around
- Prepared the matrix code for multiple styles of scanning (changed at compile time)

Makefile

@@ -48,6 +48,7 @@ TARGET = main
 SRC =	$(TARGET).c \
 	print.c \
 	usb_keyboard_debug.c \
+	scan_loop.c
 	#usb_keyboard.c