Plumb the connection though from llSetVehicleVectorParam

to the various physics engines. No connection to the 
underlying physics simulator yet, just plumbing through
the various classes.

OpenSim/Region/Physics/POSPlugin/POSPrim.cs

@@ -121,10 +121,14 @@ namespace OpenSim.Region.Physics.POSPlugin
             set { return; }
         }
 
-        public override float VehicleFloatParam
+        public override void VehicleFloatParam(int param, float value)
         {
-            get { return 0f; }
-            set { return; }
+
+        }
+
+        public override void VehicleVectorParam(int param, PhysicsVector value)
+        {
+
         }
 
         public override PhysicsVector CenterOfMass