Unique Number System Operations (#906)

* propagation of the ask pattern into the unique number actor

* TaskWorkflow as a replacement for TaskResolver; includes working tests

* AvailabilityPolicy has been changed slightly; number source restriction mechanic has been completely removed

* TaskResolver is gone and done and TaskWorkflow replaces it

* number pool variety

* every zone gets a custom tailored 'environment' number pool, as well as all other number pools; uns involves many more static functions and hard-defined variables

* repairs to uns and guidtask tests; worked uns into unops, an actorless version, but did not integrate into server

* shuffled around files in the guid package, causing import threshing; wrote extensive comments; repaired tests; classes related to the old unique number system have been removed

* created straightforward tasks; simplified number pool actor calls; repaired tests due to modifications to generic pool

* bad merge recovery

src/test/scala/objects/VehicleControlTest.scala

@@ -212,7 +212,6 @@ class VehicleControlPrepareForDeletionMountedCargoTest extends FreedContextActor
 
     override def SetupNumberPools(): Unit = {}
     override def VehicleEvents = vehicleProbe.ref
-    override def tasks = catchall.ref
   }
   zone.actor = system.spawn(ZoneActor(zone), "test-zone-actor")
   // crappy workaround but without it the zone doesn't get initialized in time