compiling but mouse interaction is dead

src/graph-manager.cpp

@@ -460,4 +460,12 @@ namespace VISEQ::GRAPH{
             n->draw(mouse_pos, camera);
         }
     }
+
+    void to_json(json& j, const std::shared_ptr<GraphManager>& G){
+        j = *G;
+    }
+
+    void from_json(const json& j, std::shared_ptr<GraphManager>& G){
+        G.reset(new GraphManager(j.get<GraphManager>()));
+    }
 }