settings: fix and pimp custom lockscreen handle (2/2)

problem on current implementation is that it is not
multiDpi compatible. As well it looks a bit weird if
the user set a square image always. This commit does

- introduce central circleimage method to get circle image crops
- before it was assumed that the height of the handle image is
  108px (mdpi base) which is correct but the original handle
  has a lot unused space around to fit better into the view.
  Whatever after messurment of the real height 68px is correct
  of course calculated against the current density
- both above combined results into a always nice looking
  custom circle icon on the lockscreen dpi and device undependent
- saved file in settings calculates the needed image size
  base on the current density.

rebase

Change-Id: Iba46fdf725be0fe785234bda3fd1ff8dbb4c1467
QS: make dynamic tiles configurable (2/2)

instead of using a bunch of provider settings var
like it was on 4.3 and almost all other roms are doing
use one and split like we do for the normal tiles. This
is more consistent and saves us to observe a bunch of values

As well this is integrated into the one layout screen we have. So
all QS related is easy and logical usable for the user on one
screen

PatchSet: added icon - thanks to kroz

Change-Id: I32756584018585644a71bce52e48a978993d27ce
QS: do not show ringer options on devices which do not support vibrate

if a device like grouper does not support vibration it does not make
sense to show the settings dialog for it due that this devices just
can switch between sound/mute

Change-Id: Ie5b188fd69376d11874ae6c2b541948d2434fd66