Centralized quick step/scrub/switch logic (1/2)

Moved all the logic for quick step/scrub/switch to QuickStepController
so touch events can be used for deciding which gesture is used. Once a
gesture is decided, the rest will not handle the other gestures.

Quickstep will trigger when passing a touch slop on navigation bar. The
event onQuickStep (with a motion event) will be sent to launcher when
this occurs telling it that systemui is not handling anymore motion
events. During quickstep motion events will still be proxied.

Used raw X and Y motion events for Opalayout and KeyButtonView so that
the moving over the touch slop can be detected to ignore button (long)
press state.

Fixes: 73971902
Fixes: 74456391
Test: swipe up
Change-Id: I40b931aa0a9f123b810ff9206c9b1ce040a68a56