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

Change-Id: If7da7fc82942ea74c46cabd48e0ee874f4c20f0a

Conflicts:
	AndroidManifest.xml
	res/values/arrays.xml
	res/values/strings.xml
	res/xml/notification_drawer_settings.xml
Settings: Add notification rows transparency (1/2)

Conflicts:
	res/values/strings.xml
Settings: Status Bar transparency and color (2/2)

This introduces status bar transparency and color changes based on an idea
of Roman.

- custom status bar color
- custom status bar transparency
- custom status bar transparency mode (launcher/launcher+keyguard/always)
- reset to default

Patchset 2:
- comment correction

cheers

Change-Id: I414f7553f58fcdc5628a314de19254ac82234cea

Conflicts:
	AndroidManifest.xml
	res/values/arrays.xml
	res/values/strings.xml
	res/xml/status_bar.xml