Made undo tool aware of circle count to decrement. Refactored tool ID's to be enum

src/tools/rectangle/rectangletool.cpp

@@ -40,10 +40,10 @@ RectangleTool::name() const
   return tr("Rectangle");
 }
 
-QString
-RectangleTool::nameID()
+ToolType
+RectangleTool::nameID() const
 {
-  return QLatin1String("");
+  return ToolType::RECTANGLE;
 }
 
 QString

src/tools/rectangle/rectangletool.h

@@ -27,7 +27,6 @@ public:
 
   QIcon icon(const QColor& background, bool inEditor) const override;
   QString name() const override;
-  static QString nameID();
   QString description() const override;
 
   CaptureTool* copy(QObject* parent = nullptr) override;
@@ -37,6 +36,9 @@ public:
   void paintMousePreview(QPainter& painter,
                          const CaptureContext& context) override;
 
+protected:
+  ToolType nameID() const override;
+
 public slots:
   void drawStart(const CaptureContext& context) override;
   void pressed(const CaptureContext& context) override;