Open the simulation speed dialog on left-click

See #143.

src/main/scala/ocelot/desktop/ui/widget/statusbar/StatusBar.scala

@@ -57,6 +57,9 @@ class StatusBar extends Widget {
         override def receiveMouseEvents: Boolean = true
 
         eventHandlers += {
+          case ClickEvent(MouseEvent.Button.Left, _) =>
+            new ChangeSimulationSpeedDialog().show()
+
           case ClickEvent(MouseEvent.Button.Right, pos) =>
             val menu = new ContextMenu
             menu.addEntry(