Settings: Notification drawer custom background + notification rows transparency (2/2)

Also included Seekbar

Ported from SlimRoms

Change-Id: Ie505b0a835b6ccfe5d9a16ef22b72d38a3fbc2e2

Conflicts:
	res/values/cm_strings.xml

Build Fixes

Change-Id: I03936a71b2bb796ddeda6dae237a898887ae2e82