rm unfinished undo/redo engine (#757)

This resolves #757 (closed).

GUI/View/SampleDesigner/SampleEditorController.h

@@ -17,6 +17,7 @@
 
 #include "GUI/Model/Sample/FormFactorItemCatalog.h"
 #include "GUI/Model/Sample/ItemWithParticlesCatalog.h"
+#include <QObject>
 
 class CompoundItem;
 class CoreAndShellForm;
@@ -70,10 +71,8 @@ public:
     void addLayerItem(LayerItem* before);
     QColor findColor(int atIndex);
     void onLayerAdded(LayerItem* layer);
-    void addLayerItemFromUndo(int atIndex);
     void duplicateLayerItem(const LayerItem* layer);
     void removeLayerItem(LayerItem* layer);
-    void removeLayerItemFromUndo(int atIndex);
 
     void onLayoutAdded(LayerForm* layerForm, ParticleLayoutItem* layout);
     void addLayoutItem(LayerForm* layerForm);
@@ -102,7 +101,6 @@ public:
     void setIntegrateOverXi(LatticeTypeSelectionForm* widget, bool value);
 
     void setDouble(double value, DoubleProperty& d);
-    void setDoubleFromUndo(double value, const QString& path);
 
     void setCurrentIndex(ISelectionContainerForm* widget, int index, ISelectionProperty& d);
 
@@ -132,7 +130,10 @@ private:
     ItemWithParticles* createAndInitItem(FormFactorItemCatalog::Type formFactorType) const;
     ItemWithParticles* createAndInitItem(ItemWithParticlesCatalog::Type itemType) const;
 
-private:
+    void addLayerItemFromUndo(int atIndex);
+    void removeLayerItemFromUndo(int atIndex);
+    void setDoubleFromUndo(double value, const QString& path);
+
     SampleItem* m_sampleItem;
     SampleForm* m_sampleForm;
     ProjectDocument* m_document;