Apps: Add blacklist interface [1/2]
Include peek and floating mode implementations.
Applies to every floating mode launch way.

Change-Id: I66f85835ad9579f36c3f33f3af9871897721bf78
Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>

Conflicts:
	packages/SystemUI/res/values/n5x_strings.xml