Allow changing screen-off animation (1/2)

* Allow enabling/disabling screen-off animation
* Allow selection between fade & crt effects if the device allows it

Change-Id: If6bb9afd7a753e1df013e88f7f39cea94e8fe565
Merge "Allow changing screen-off animation (1/2)" into cm-11.0
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0