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.

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

Change-Id: I522fceee353bebad8d1629b137370d875bafb402
Remove Superuser and Performance settings from settings header, Fix build errors.

Change-Id: I2dab36d10a60773c4ab9d5a5f1fe816ec52e5193