Refactor touchpad movement generation by migrating MovementMaker to userland.

This considerably overhauls touchpad event generation, simplifying and
cleaning it up considerably:

* Return the touchpad specifications through the MS_IS_TOUCHPAD ioctl.

* There is now a dedicated MS_READ_TOUCHPAD ioctl, as touchpads
can either return touchpad_movement structures or mouse_movement
ones depending on what mode they are operating in.

* Event repeating on timeouts is now handled in MovementMaker and
the input_server control thread, so MS_READ_TOUCHPAD takes
a timeout value. This means we can drop all the EventProducers.

* Use the real floating-point math functions in MovementMaker now
that we are running in userland.

* Drop unused structures, constants, headers, and other things
related to touchpad support.

Change-Id: I28cdb28e4100393a9338a8ebb865573cec13fc1e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5455
Reviewed-by: waddlesplash <waddlesplash@gmail.com>