Add oneshot modifier action.

Fix keycodes. It has 32 Fn keys now.

Remove test_func.

New tapping logic.

Minor fixes in keyboard.c.

Add prototype of Action Function.

Add bootmagic keys.(hhkb)

- kick bootloader
- enable debug print

Fix mods with tapping.

Refactor struct keyevent_t.

Fix mods with tap key but some problems still exists.

- stuck tap key after tapping. seq[mods(d), key(d), mods(u), key(u)]
- tap key doesn't work when fast type. [key(d), mods(d), key(u),
  mods(u)]

Add support partly for modifier with tap key.

Fix waiting_keys and periodical update for delaying layer.

Fix tap key using delaying_layer and waiting_key.

Add new layer actions.

Fix action of system and consumer usage.

Add initial fix for new keymap.

Fix image link 3 :(

Fix image link 2

Fix image link in README.md

Improve documentation