Switch to static mode and recenter whenever screen moves

This logic intends to solve issues related to using head-tracking
while moving (e.g. being in a moving vehicle of walking).

We do so by switching to static mode and recentering whenever we
detect a significant motion of the screen.

Test: Manual verification via the SpatialAudioDemo app.
Test: atest --host libheadtracking-test
Change-Id: Iae5090c5a315d31ff89ada8d8a13694ea68ccf8e