Reduce memory leaks by removing all views.

Change-Id: I1c7d3647ae0d40aa214108ea22e007e3cb3191b9

Patchset: 3
http://review.cyanogenmod.org/#/c/63034/

Comments from Clark:

The results from people trying out this patch are very positive
and we may want to go ahead and merge this in for the time being.
A better solution can always be implemented later on but if this
is reducing the possibility of memory leaks in SystemUI then I
say we merge this ASAP.
Make KeyguardMultiUserAvatar fully themeable

Create the animation color for the username text based on the final
color.

Change-Id: I4b1beb70160e178264c32f3b33c6c0c7c51f70c5
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>