QuickSettings: add holo dark/light theme chooser (2/2) - WIP

This is the work of RoLa which I am finishing for him

This has been adapted for Orca, lets get it working...
Change-Id: Ibf4b9915db9ae641251513dbdab813d0f4f1ada1
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>