Enable loading of product by double clicking in the resource explorer

- Doesn't work if radar product manager is expired for the site (time not present in record map)
- Need to fix going back to expired (garbage collected) live data

scwx-qt/source/scwx/qt/main/main_window.hpp

@@ -45,6 +45,7 @@ private slots:
    void on_radarSiteSelectButton_clicked();
    void on_resourceTreeCollapseAllButton_clicked();
    void on_resourceTreeExpandAllButton_clicked();
+   void on_resourceTreeView_doubleClicked(const QModelIndex& index);
 
 private:
    std::unique_ptr<MainWindowImpl> p;