reworked much of keyframeview for new architecture

app/widget/keyframeview/keyframeview.h

@@ -34,19 +34,13 @@ public:
   void SetMaxScroll(int i)
   {
     max_scroll_ = i;
+    UpdateSceneRect();
   }
 
-  void SetElementY(const NodeInput& c, int y);
-
 protected:
   virtual void SceneRectUpdateEvent(QRectF& rect) override;
 
-public slots:
-  virtual KeyframeViewItem* AddKeyframe(NodeKeyframe* key) override;
-
 private:
-  QHash<NodeInput, qreal> element_y_;
-
   int max_scroll_;
 
 };