Port action_* to mbed

Merge branch 'mbed' into dev

Add checksum tool for NXP LPC

Add LED indicator support in mbed

Port ps2_usb to mbed

Fix build files for mbed

Fix common files for mbed

Fix debug.h and remove debug_config.h

Port action_* to mbed

Fix print and timer

Port timer to mbed

Add keyboard/mbed_onekey

Just ignore ADB Service Request

- to support Adjustable keyboard(composite device?)

Fix 'debug-off' target of hhkb to remove 'print'

Fix NKRO code when NKRO is disable

Fix READEM of hhkb and doc/build.md

Fix document on HHKB internal

Add HHKB JP support

- scan matrix about twice faster

Merge pull request #124 from kairyu/6kro

USB 6KRO with pseudo- or half- NKRO feature

Merge pull request #112 from shayneholmes/ee_nkro_use_reserved_bit

Adding NKRO virtual dip-switch, using existing bit in keymap byte.