Cleans up quantum/keymap situation, removes extra lufa folders (#416)

* sorts out keycodes

* move midi around

* remove mbed

* replaces keymap with qmk/keymap_common

* fixes keymap.h

* keymap, config, quantum rearrange

* removes unneeded lufa stuff

quantum/audio/audio_pwm.c

@@ -6,7 +6,7 @@
 #include <avr/io.h>
 #include "print.h"
 #include "audio.h"
-#include "keymap_common.h"
+#include "keymap.h"
 
 #include "eeconfig.h"