Update overview from home transitions

For both NoButtonNavbarToOverviewTouchController and
NavBarToHomeTouchController:
- Have consistent resistance applied such that RecentsView scales
  down and translates up slightly (but not as much as from an app)
- Have consistent animation to home if you fling to that state
  rather than stay in overview. This is handled by a new class,
  OverviewToHomeAnim, which consolidates logic from NBTHTC and
  overrides some interpolators such that RecentsView doesn't fade
  out or translate downwards during the animation (it just slides
  off the screen while the home animation plays).

Also make overview actions not clickable when alpha == 0, so that
you can tap the hotseat/qsb during the transition from home to
overview.

Bug: 144170434
Change-Id: Ic291f285ff2f63c477633c48d4fadb23cf70c28a