code: public static LayerableConfig imports(Xml root)
      {
          Check.notNull(root);
  
          final Xml node = root.getChild(NODE_LAYERABLE);
          final int layerRefresh = node.readInteger(ATT_REFRESH);
          final int layerDisplay = node.readInteger(ATT_DISPLAY);
  
          return new LayerableConfig(layerRefresh, layerDisplay);
      }
docs: Imports the layerable config from node.
  
  @param root The root reference (must not be <code>null</code>).
  @return The layerable data.
  @throws LionEngineException If unable to read node or invalid integer.