NotificationHelper: Create broadcast receiver for Peek app

Store showing state.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
NotificationHelper: Define Peek app broadcast intents

Continue this https://gerrit.paranoidandroid.co/#/c/4369/

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
[1/2] Add support for Peek app

Disable built in peek when Peek app is installed. Enable it again on app's unistall.

Change-Id: I292cfa6ba351ac65fd67d902b5e4df9be29981ac
Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>