v3.1.3

• New features:
  ** Set the item height request to the NavigationDrawer.
  ** Add support for a leading icon and a trailing icon on the NavigationDrawer.
  ** Add support item dividers on the NavigationDrawer.
  ** Add AcceptIsVisible, CancelIsVisible and QuickSelectionCommand to MaterialDialog.
  ** Add Opened and Closed events to the BottomSheet.
• Bug fixing:
  ** Fix an issue changing the ItemSource on the NavigationDrawer.
  ** Fix the issue setting the MaterialButton's HeightRequest from styles.