Draft groups in layers menu

TODO: don't use Bootstrap's switches!!

scenes/ssgp/index.js

@@ -9,5 +9,8 @@ initStimulus();
 AppState.currentScene = 'ssgp';
 const marker = config.markers.find(m => m.id === 'ssgp');
 AppState.normalizedNodes = normalizeNodes(marker.nodes).flat;
+AppState.treeNodes = normalizeNodes(marker.nodes).tree;
+
+//console.debug(AppState.treeNodes);
 
 openScene(marker, AppState.normalizedNodes);