Multi pane preference settings

Signed-off-by: Paul Beeler <sparksco@gmail.com>

Conflicts:
	res/values/arrays.xml
	res/values/strings.xml
	res/xml/system_settings.xml
	src/com/android/settings/saber/SystemSettings.java

derp
Signed-off-by: Paul Beeler <sparksco@gmail.com>
Improve dual pane preferences summary
Expose User interface only on selected devices

Signed-off-by: Paul Beeler <sparksco@gmail.com>

Conflicts:
	src/com/android/settings/saber/SystemSettings.java
Show preference for NavRing only on USER_OWNER
Signed-off-by: Paul Beeler <sparksco@gmail.com>
About nexus
Signed-off-by: Paul Beeler <sparksco@gmail.com>