ADD: keymap macro for Apple Extended Keyboard in adb/keymap.c
FIX: keycodes for Keypad, Fn and Mousekey.

ADD: Build option: MATRIX_HAS_GHOST to enable ghost blocking logic.
FIX: choose matrix buffer type(uint8_t/uint16_t) automatically
     depending on column size in matrix.c.
FIX: use uint8_t insted of int in matrix.c.

Change build options:  Makefile and config.h. See README.

FIX: keymap