finished merge of viewer and footage

app/project/projectviewmodel.h

@@ -104,6 +104,11 @@ public:
    */
   QModelIndex CreateIndexFromItem(Node *item, int column = 0);
 
+signals:
+  void ItemAdded(Node* node);
+
+  void ItemRemoved(Node* node);
+
 private:
   /**
    * @brief Retrieve the index of `item` in its parent