Add the JS stuff and a little bit more python glue to make overlays only display for a specified render

overviewer_core/data/js_src/util.js

@@ -64,8 +64,6 @@ overviewer.util = {
         }
 
         var overlayControl = new overviewer.views.OverlayControlView();
-        overlayControl.registerEvents(overlayControl);
-        overlayControl.render();
 
         var spawnmarker = new overviewer.views.SpawnIconView();
 
@@ -85,6 +83,9 @@ overviewer.util = {
             compass.render();
             spawnmarker.render();
 
+            // update list of spawn overlays
+            overlayControl.render();
+
             // re-center on the last viewport
             var currentWorldView = overviewer.mapModel.get("currentWorldView");
             if (currentWorldView.options.lastViewport) {