HHKB pro2 layout changer

[hasu]

This board can change layout of HHKB including Fn key and be located between switch matrix and controller to intercept its signals instead of replacing HHKB original controller.

Only merit comparing to replacing controller:
- USB hub still available

No fancy feature like:
- media keys and system control keys
- mousekey
- USB NKRO

[Status] Still in development
2012/11/16 Installed prototype board

[TODO]
- Firmware
- Schematic/PCB in CAD