It will be the biggest historic redevelopment project in its history, but the nonprofit lender and developer Self Help said it is confident it can fulfill a vision of a fully reborn community along the Yanceyville Street corridor in Greensboro. Self Help Ventures Funds, the development unit of the Durham-based organization, won the foreclosure auction for the Revolution Mill, a sprawling 630,000-square-foot former Cone Mills textile plant that has been partially redeveloped into Class A office space.