Add layering to scripting overlay

include/ui/graphicsview.h

@@ -12,11 +12,13 @@ class GraphicsView : public QGraphicsView
 public:
     GraphicsView() : QGraphicsView() {}
     GraphicsView(QWidget *parent) : QGraphicsView(parent) {}
+    Overlay * getOverlay(int layer);
+    void clearOverlays();
 
 public:
 //    GraphicsView_Object object;
     Editor *editor;
-    Overlay overlay;
+    QMap<int, Overlay*> overlayMap;
 protected:
     void mousePressEvent(QMouseEvent *event);
     void mouseMoveEvent(QMouseEvent *event);

include/ui/overlay.h

@@ -75,6 +75,7 @@ public:
     ~Overlay() {
         this->clearItems();
     }
+    void renderItems(QPainter *painter);
     QList<OverlayItem*> getItems();
     void clearItems();
     void addText(QString text, int x, int y, QString color = "#000000", int fontSize = 12);