Extract pointing fingers

Multi-finger clicks and taps are goverened by the number of pointing
fingers on the trackpad. This number can be different from the actual
number of fingers on the trackpad. For instance, a finger resting at
the bottom of an integrated button, or a finger that accidentally
touches the pad during a press, are not pointing fingers. This patch
introduces extract_pointers(), which computes the number of pointing
fingers on the trackpad, and uses that number to determine the logical
button state.

[rydberg@euromail.se: various cleanups]
Signed-off-by: Arturo Castro <arturo@openframeworks.cc>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

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