Comment: Much of the world we have built to live in – from the things we use, to signage, to magazine and website pages, to homes, towns and cities – has been designed by fit and healthy people. And much of it doesn’t work for many of us. March 1 is International Wheelchair Day and having an international awareness day for wheelchair users is a worthy idea – but I bet it won’t filter through to those busy people who park in a space designated w…