HeadsUp: Filter out notifications from system uid packages.

    - Settings is very spammy in its notifications, so lets
    just ignore them.

Change-Id: Ic269e8727efb2021d76cccecb9f7e555034d1925
HeadsUp: Add heads up blacklist options. (1/2)

Change-Id: If9e5eed658871400b3c21d9354262e0887bc592e