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touchpad: make tp_detect_jumps() time-independent

Peter Hutterer requested to merge whot/libinput:wip/time-independent-jump-detection into master

This function expected distances per-frame, not per-time which gives us different behaviors depending on the hardware scanout rate. Fix this by normalizing to a 12ms frame rate which reflects the touchpad I measured all the existing thresholds on.

This is a bit of a problem for the test suite which doesn't use proper intervals and the change to do so is rather invasive. So for now we set the interval for test devices to whatever the time delta is so we can test the jumps without having to worry about intervals.

Fixes #121 (closed)

Related to #36 (closed)

CC @mdmayfield

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