Add active display settings

credit to 0xD34D and whoever wrote the feature.  i found it
in his gerrit unfinished/broken and simply fixed it, improved &
optimized.

PS2: git add

Change-Id: Ia8a264783e33d7aba646283ef8417984859065e7
Settings: cleanup on isle WHAT THE FUCK?!

clean up some wicked fucking sloppy code from 6 months ago
fix context leak
remove widget enlargement (huh-huh) preference from phablet
disable initial keyhints on lockscreen carousel (it doesn't work)

i've obviously improved haha

Change-Id: Iaba0a1fa81a0b752b7f195a710281cca5823aebd
Merge changes Iaba0a1fa,Ia8a26478 into jb43

* changes:
  Settings: cleanup on isle WHAT THE FUCK?!
  Add active display settings