constify struct cfattach

Use the new input functions of wsmouse in mouse and touchscreen drivers.

ok stsp@ kettenis@

Add support for a fourth axis on wsmouse devices, e.g. on the Apple Might
Mouse. Currently limited to USB mice.

Adapted from a diff from Gareth <garf@loveandnature.co.za> on tech@

Button boxes have their Y axis inverted, compared to mice, so compensate
before feeding wscons.

Fix various gremlins in the hilms code my simple test program did not catch,
but XFree did.

New hil child devices attachment framework, that allow them to be detached
at runtime.

Handle reconfiguration notices from the loop, and do the necessary
detach/attach work so that our vision of the

New hil child devices attachment framework, that allow them to be detached
at runtime.

Handle reconfiguration notices from the loop, and do the necessary
detach/attach work so that our vision of the loop is in sync with reality.

Adapt all hil child devices to the above changes.

"This is not as plug'n'play as usb, but you get the same feeling anyways..."

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A simple driver for HIL mice and tablets. Most of the work being already
done by the loop, this is mostly an HIL packet decoding routine.