base

Allow Shell to change component enabled state

But make sure that we don't allow Shell or other apps
to disable an active profile or device owner.

Also limit exactly what states Shell can switch apps
between, similar to Settings UI.

This is required for some CTS tests

Bug: 27924655
Change-Id: I958f0d1de7f0bc1f5a0cbf853d57dfdeb2f9ad59