[CR] Roadblocks

I hated to leave that stash code sitting around unused, and given martial law and other similar counterinsurgency/zed-containment issues, roadblocks seemed an obvious solution.

Also includes a new turret and Upgraded high-end military bots.  Hopefully you've got a spare LAW sitting around.
I agree that we want a warning of some kind, but don't like the premonition
idea.  Plus laser dots are spooky.