Apps: Add blacklist interface [1/2]

Include peek and floating mode implementations.
Applies to every floating mode launch way.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Change-Id: Ica523625c9061cf9c8d6c3d7df4acf6a125c4ead

Conflicts:
	packages/SystemUI/res/values/pa_strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	services/java/com/android/server/NotificationManagerService.java