2. Flash NumLock led only when "numpad" layer is active
3. Command (in terms of IS_COMMAND) to switch to no-leds mode
4. Increase count of ACTION keys
6. Fix command_state() onboard led:
    it should flash only when kbd in some specific mode (CONSOLE || MOUSE)
7. ergodox_blink_all_leds() should save current state of leds,
    and restore after blink. initial state of all leds == off
8. add support for pseudo-backlight (reversed LEDs) + docs/photo
9. command to debug all LEDs (on/off/blink)