HeadsUp: Add blacklist feature (2/2)

Change-Id: I6dcec1edb0b1f21917730794311324d1780a4f23
HeadsUp: User configurable timeout (2/2)

Change-Id: I6c55636205237044891324f0dd855046aaafb256
HeadsUp: option to launch in floating window (2/2)

Change-Id: Ibbdbf7957738d2301eacc190a0ab408ce20350b5