ensure objects are in the correct thread when loading

Since we load in a separate thread, when the QObject based objects are
instantiated, they're created with affinity to that separate thread. Now we
specifically ensure they are moved to the main thread after their creation.

app/node/node.h

@@ -68,12 +68,12 @@ public:
   /**
    * @brief Clear current node variables and replace them with
    */
-  void Load(QXmlStreamReader* reader);
+  void Load(QXmlStreamReader* reader, QHash<quintptr, NodeOutput*>& param_ptrs, QList<NodeInput::SerializedConnection> &input_connections, const QString &element = QString());
 
   /**
    * @brief Save this node into a text/XML format
    */
-  void Save(QXmlStreamWriter* writer) const;
+  void Save(QXmlStreamWriter* writer, const QString& custom_name = QString()) const;
 
   /**
    * @brief Return the name of the node