Add preference for enabling root access (3/3)

 * Root over ADB is now disabled by default on non-eng builds
 * Requires support in su binary and adbd
 * Root access can be configured to use ADB only, apps only, or all

Change-Id: I132a35a31c676511db954ff19120fa6d3c795b23

Conflicts:

	res/values/arrays.xml
	res/xml/development_prefs.xml
Hide Superuser entry if root access for apps is disabled.

Change-Id: Ibb77ba5a0fccf22564a26b8b1e13f7762c65718e
Switch to new Superuser

Change-Id: I9d91392ad6fbc9953d19059ab59b91d214c00e0c

Conflicts:

	AndroidManifest.xml
	proguard.flags
	res/xml/settings_headers.xml