core: add support for translucent volume panel

Add support for display the volume panel in translucent mode

Patchset 4: Make it depends to high-end graphics flag

Change-Id: I4f21a6cc88282789072a0e71ae696b754a5e083e
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Merge "core: add support for translucent volume panel" into cm-11.0
Core/SystemUI: Update resources

* Remove several aapt warnings
* Remove unused strings
* Move symbol picker strings to cm_extra as they are not meant to be translated, only meant to be adjusted per country. Also removed the strings from all languages, since they were the same.

Change-Id: I2391bdd70a81cd4c126af80b6d9bc7458ea4a639
Merge remote-tracking branch 'upstream/cm-11.0' into berserk