Add connection between SpeedSlider and SpeedSpinbox

include/interface.hpp

@@ -20,6 +20,11 @@ public:
     MainWindow(QWidget *parent = nullptr);
     ~MainWindow();
 
+private slots:
+    void on_simSpeedSpinbox_valueChanged(int arg1);
+
+    void on_simSpeedSlider_valueChanged(int value);
+
 private:
     Ui::MainWindow *ui;
 };

src/interface.cpp

@@ -13,3 +13,12 @@ MainWindow::~MainWindow()
     delete ui;
 }
 
+void MainWindow::on_simSpeedSpinbox_valueChanged(int arg1)
+{
+    ui->simSpeedSlider->setValue(arg1);
+}
+
+void MainWindow::on_simSpeedSlider_valueChanged(int value)
+{
+    ui->simSpeedSpinbox->setValue(value);
+}