FW: Active Display [1/2] + AppBar fixes

* Didn't tested with ur frameworks. Let me know.

Also, moved the appbar to BaseStatusbar according to Chaos recents commits.

PS4: Remove duplicates in core/res/res/values/symbols.xml

PS5: Corrected my derp in the commit message.

PS6: Changed dependent commit
     removed android-logo-mask.png

PS9: prevent NPE if dismissed called with null mNotification

PS10: Commit msg update

PS11: make sure mNotificaiton is set correctly
      register/unregister recievers and listeners when enabled/disabled

Signed-off-by: iGio90 <giovanni.rocca.90@gmail.com>

Change-Id: Ia35cf32cbba54b7ef074df262364bb8107c5068d