Retrieve QUndoStack pointer from core and create actions for undo and redo.

mainwindow.h

@@ -7,6 +7,7 @@ QT_BEGIN_NAMESPACE
 
 class QAbstractItemModel;
 
+class QUndoStack;
 namespace Ui {
 class MainWindow;
 }
@@ -43,6 +44,7 @@ class MainWindow : public QMainWindow {
   // GenericCore* m_core;
   unique_ptr<GenericCore> m_core;
   shared_ptr<QAbstractItemModel> m_tableModel;
+  shared_ptr<QUndoStack> m_modelUndoStack;
 
   /// File actions
   unique_ptr<QAction> m_newFileAct;