Implement Dynamic System Bars [1/2]
This commit implements DSB. Simple as that.
All the changes:
- frameworks/base (I3bc7102b2139fd1fa3de22aac096bd2a75bde878)
- packages/apps/Settings (Id2b105dfb3faf3cad74d0fa0dc33d01f6b71a853

Change-Id: I6382ee05b2c77a33c8f51561cb09c8cf99eacd80
Signed-off-by: klozz <xxx.reptar.rawrr.xxx@gmail.com>