wrote mechanisms that allow the tracks to be resized from the trackview

app/node/output/timeline/timeline.h

@@ -70,6 +70,8 @@ signals:
   void TrackAdded(TrackOutput* track, TrackType type);
   void TrackRemoved(TrackOutput* track);
 
+  void TrackHeightChanged(TrackType type, int index, int height);
+
 protected:
   virtual NodeValueTable Value(const NodeValueDatabase& value) const override;
 
@@ -93,6 +95,8 @@ private slots:
 
   void TrackListAddedTrack(TrackOutput* track);
 
+  void TrackHeightChangedSlot(int index, int height);
+
 };
 
 #endif // TIMELINEOUTPUT_H