By Mike McGann, Editor, The Times COATESVILLE — It was a good a day as the city has seen in recent memory — finally, a real, honest to goodness revitalization project is underway, with the start of demolition for Coatesville Gateway. But if you live in fashionable Unionville or Kennett or elsewhere in Chester County, you may shrug and say “why do I care?” You should care for the simple reason...