keyframes: implemented deleting keyframes with the delete shortcut

app/panel/curve/curve.cpp

@@ -37,6 +37,11 @@ NodeInput *CurvePanel::GetInput() const
   return static_cast<CurveWidget*>(GetTimeBasedWidget())->GetInput();
 }
 
+void CurvePanel::DeleteSelected()
+{
+  static_cast<CurveWidget*>(GetTimeBasedWidget())->DeleteSelected();
+}
+
 void CurvePanel::SetInput(NodeInput *input)
 {
   static_cast<CurveWidget*>(GetTimeBasedWidget())->SetInput(input);

app/panel/curve/curve.h

@@ -34,6 +34,8 @@ public:
 
   NodeInput* GetInput() const;
 
+  virtual void DeleteSelected() override;
+
 public slots:
   void SetInput(NodeInput* input);
 

app/panel/param/param.cpp

@@ -59,6 +59,11 @@ void ParamPanel::SetTimestamp(const int64_t &timestamp)
   }
 }
 
+void ParamPanel::DeleteSelected()
+{
+  static_cast<NodeParamView*>(GetTimeBasedWidget())->DeleteSelected();
+}
+
 void ParamPanel::Retranslate()
 {
   SetTitle(tr("Parameter Editor"));

app/panel/param/param.h

@@ -38,6 +38,8 @@ public slots:
 
   virtual void SetTimestamp(const int64_t& timestamp) override;
 
+  virtual void DeleteSelected() override;
+
 signals:
   void TimeTargetChanged(Node* node);