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/keymap_extras/keymap_bepo.h

@@ -2,7 +2,7 @@
 #ifndef KEYMAP_BEPO_H
 #define KEYMAP_BEPO_H
 
-#include "keymap_common.h"
+#include "keymap.h"
 
 // Alt gr
 #ifndef ALTGR