Test hacky object refresh method.

SimSet::refresh ticks through a SimSet over multiple function calls,
simply doing a NOOP on the position field. This is enough to cause
setMaskBits to be called and update the object on all clients, leading
it to be dropped if it's out of scope for some of them.

tutorials/client_server/server.cs

@@ -61,11 +61,48 @@
          ambient = "0.1 0.1 0.1";
          castShadows = true;
       };
-      new StaticShape(Cube) {
-         datablock = CubeShape;
-         position = "0 20 1";
+      new SimGroup(Cubes) {
+         new StaticShape(Cube) {
+            datablock = CubeShape;
+            position = "0 20 1";
+         };
+         new StaticShape(Cube2) {
+            datablock = CubeShape;
+            position = "0 40 1";
+         };
+         new StaticShape(Cube3) {
+            datablock = CubeShape;
+            position = "0 60 1";
+         };
+         new StaticShape(Cube4) {
+            datablock = CubeShape;
+            position = "0 80 1";
+         };
       };
    };
+
+   Cubes.refresh(1000, 2);
+}
+
+function SimSet::refresh(%this, %period, %objectsPerIteration) {
+   %this._refresh = %this.schedule(%period, refresh, %period, %objectsPerIteration);
+
+   if(%this._refreshIndex $= "") {
+      %this._refreshIndex = 0;
+   }
+
+   %i = %this._refreshIndex;
+   %max = %this.getCount()-1;
+   for(%j = 0; %j < %objectsPerIteration; %j++) {
+      if(%i > %max) {
+         %i = 0;
+      }
+      %obj = %this.getObject(%i);
+      %obj.position = %obj.position;
+      %i++;
+   }
+
+   %this._refreshIndex = %i;
 }
 
 // Called when the engine is shutting down.