Introduce new layouts.Grid construct

dialog.go

@@ -66,7 +66,7 @@ func NewDialog (kind DialogKind, parent tomo.Window, title, message string, opti
 	dialog.controlRow.SetAlign(tomo.AlignEnd, tomo.AlignEnd)
 
 	dialog.SetRoot(NewOuterContainer (
-		layouts.NewGrid([]bool { true }, []bool { true, false }),
+		layouts.Column { true, false },
 		NewInnerContainer(layouts.ContractHorizontal, icon, messageText),
 		dialog.controlRow))
 	return dialog, nil