Input device handling in console

[rkujawa]

Console should have configurable output and input devices. Input device could be for example built-in keyboard.

[rkujawa]

The necessary dependencies of MFP and ACIA are sort-of implemented now. The next step should be implementing IKBD protocol and designing some layer for generic keyboard support.

[rkujawa]

IKBD implemented as of 6a40bc7. Next some keymap support should be added...

[rkujawa]

Keymap support still pending.