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

tmk_core/common.mk

@@ -6,7 +6,6 @@ SRC +=	$(COMMON_DIR)/host.c \
 	$(COMMON_DIR)/action_macro.c \
 	$(COMMON_DIR)/action_layer.c \
 	$(COMMON_DIR)/action_util.c \
-	$(COMMON_DIR)/keymap.c \
 	$(COMMON_DIR)/print.c \
 	$(COMMON_DIR)/debug.c \
 	$(COMMON_DIR)/util.c \