Framework: Make the dialog divider color themeable

The holo blue color might not be suitable for some themes. This commit
swaps out the background of all titleDivider elements to use another
resource. This has no difference from the perspective of the user of a
"stock" build but this is huge for theme users.

Thanks to Arz Bhatia for the suggestion.

Change-Id: Icb917220accac3ad38770067120a7b1be894961a
SystemUI: Separate system bar BGs for themes

This commit separates the navigation bar background colors from the
status bar background colors which allows more modular theme-ability.
Backwards compatibility for the old system bar values is still
preserved, but the new values are to be prioritized.

Thanks to Arz Bhatia for the suggestion.

Change-Id: Ibe579d16ea35ca5bdcfe9f98143c3f91cd24900f
SystemUI: Follow CM changes for system bars [PS3]

Tracking http://review.cyanogenmod.org/69166
For initial change ID Ibe579d16ea35ca5bdcfe9f98143c3f91cd24900f

This commit removes some hardcoded values and cleans up special casing
as suggested by people in CM. This shouldn't really change anything
for the end user or the theme creator. This only makes the codebase
easier to maintain and understand later down the line.

Change-Id: I8c70e2f1ab7ac789d8beb21a4e8ae7f32db9f015
Themes: Whitelist animations

Change-Id: I981a8e4741cf03d8649bc4828e597d1a7035e080
Load original drawable if cached icon throws NotFoundException

If for some reason we get a NotFoundException while trying to retrieve
a cached icon we will attempt to load the original.

Change-Id: I36a708d3e653fed12e88fe93c6d0a7f8e46726c9