Settings: Port notification drawer custom background (1/2)

Change-Id: If7da7fc82942ea74c46cabd48e0ee874f4c20f0a

Conflicts:
	AndroidManifest.xml
	res/values/strings.xml
	res/xml/notification_drawer_settings.xml
Cosmetic change for DensityChanger

Conflicts:
	res/xml/user_interface_settings.xml
	src/com/android/settings/slim/UserInterface.java
LCD density wizard clears now also gms and gsf
Settings: Add notification rows transparency (1/2)
Configurable Notification Behavior [1/2]

Credit: Michele Primavera

Change-Id: I74c422a5acc95fc8ddde17809d6c5b3472772de9

Conflicts:
	res/values/strings.xml
	res/xml/notification_drawer_settings.xml
	src/com/android/settings/slim/NotificationDrawerSettings.java
What else Fixes