Launch SuperSU from Settings

If SuperSU is installed, show an entry in Settings below
"Developer options", which launches SuperSU when tapped.
At boot time SuperSU will detect if com.android.settings
contains the resources from this patch, and if so it
will hide itself from the launcher. This was implemented
in v1.85, so we only show the entry if the installed
SuperSU version is at least that.

Change-Id: I1796d92458587b9e961d5d8e6d58099e8367834d
[1/2] Settings: interface settings restructering

Change-Id: I3de1cc9367deaa31baf6c2e86b8da7084ef788d1

Conflicts:
	AndroidManifest.xml
	res/values/custom_strings.xml
	res/xml/settings_headers.xml
	src/com/android/settings/Settings.java