Merge branch 'sun'

Use software serial for Sun.

Add Sun converter initial files.

Merge branch 'layerfix'

Add child proof keyboard locking feature!

Fix: add wait for Power down command
Add ifdef of MOUSEKEY_ENABLE

Fix projects for new keycodes

Fix HHKB iWRAP build

Fix HHKB keymap

HHKB scan matrix: fix wait time on power on

Add command console and mouseky parameters tweak.

Add Mousekey parameters and accel keys.

Fix commands

Fix use of default_layer

Fix layer switching and host API.

Add subset of Xorg MouseKey acceleration parameters.

Fix build option MOUSEKEY_ENABLE.

Clean host.h interface.

Add keycode.h and remove usb_keycodes.h.

Add consumer/system usage support.

Add repeating of Fn key with alt keycode.