nusb/kb: multitouch support (touchscreens, stylus)

touchscreens signal multiple contact points (X/Y) in
the hid descriptor separated by being nested in separate
collections. the contact point is identified by a
optional contact id. if omited, we use the collection
index and report id.

so we collect all the items (X/Y, buttons, wheel) from
separate collections in Hidslot structures and in the
end combine all the slots together.

buttons are or'ed together while absolute X/Y is applied
when it changed. relative X/Y deltas get added together.

thanks to kivik and Glats for testing.

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