Port: AOKP navbar navring to settings

Change-Id: I3db679b3d6b085ad9419219f1ea8bcbb5c82f548

Conflicts:

	AndroidManifest.xml
	res/values/dimens.xml
	res/values/strings.xml
	res/xml/prefs_navbar.xml
	res/xml/settings_headers.xml
	res/xml/system_settings.xml
	src/com/android/settings/cyanogenmod/NavBar.java