Settings: Security: implement a pin keypad shuffler [2/2]

    this is to further prevent people using the tablet guessing your pin based on fingerprints left on the screen
    example of the expected outcome - https://www.dropbox.com/sh/r3xb2q53ksaqni9/Oz1Eu8Dm7O

Change-Id: I60b9ad7e1dc4a5edb5e2bcd59021bed01cc5db1f

Conflicts:

	res/values/arrays_custom.xml
	res/values/strings_custom.xml
Active notifications:

combine active display and lockscreen notifications. Also improve
and modify/fix up the originals

David96 -> lockscreen notifications
clark scheff -> active display

Change-Id: I7eeb20cdbfd4dc85114b2422ec5e27ac9fa9d452