Fade in/out taskbar when launching apps from or back to AllApps/-1

- Added isHotseatIconTopWhenAligned to control both iconAlignment and stash animation to just fade in if hotseat icon isn't on top of the screen in the aligned state

Fix: 257355864
Fix: 213455090
Test: Launch apps from/back to home, taskbar animate from/to hotseat
Test: Launch apps from/back to AllApps/-1, taskbar fade in/out
Test: Repeat aboth with transient or persistent taskbar
Change-Id: I6bdae615ff9e199d23cbfe2d26c8d46a08fbc436