implement cloud browser

engine/app.h

@@ -126,6 +126,10 @@ public:
     void dialog_browse();
     void dialog_export();
     void dialog_layer_rename();
+
+    void cloud_upload_all();
+    void cloud_browse();
+
     void brush_update();
 
     void cmd_convert(std::string pano_path, std::string out_path);