Don't show Superuser option if SuperSU is installed

This will make sure it is hidden if a user switches from superuser to SuperSU after enabling superuser (reverted from commit 5660c69c2dd168888b34383fe92a0d20020f7aa5)
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.

PS3 - Added material green icons for SU

Change-Id: I2af95a1a4396101ff87448cd0ae20addf235af52 (reverted from commit 5f60eceefb8abe359875056b219d576ac7bd31ad)