qte, qte-mt 2.3.10: Elaborate "kernel keyboard" handler, make it default.

qte, qte-mt 2.3.10: Elaborate "kernel keyboard" handler, make it default.
* Details:
    1. Added support for nicely named and extensible key bindings.
       E.g., in loadkeys do:
         keycode 155 = F100
         string F100 = "power"
       where 155 is keycode a power button happens to have on your machine, F100 is
       arbitrary function key (please use F100-F120), and "power" is OPIE binding.
       Currently defined bindings are "power", "backlight", "record"
    2. K_DO ("Do") keycode is mapped to OPIE power button by default. Kernel uses
       K_DO for KEY_POWER input subsystem keycode. So, if your device does the right
       thing, it will work out of the box.
    3. Implemented NumLock handling for numeric keypad.
* TODO: This shouldn't override QTE's standard TTY handler, instead should be
separate, but default, handler.
* TODO: Drop outdated adhoc device handlers in favor of this one.