John Hopewell Chief International CorrespondentOne of the major figures at this year’s Venice Film Festival, Academy Award-nominated “Call Me By Your Name” director Luca Guadagnino will serve as president of the main competition official jury at Spain’s 68th San Sebastian Festival.The announcement comes as Guadagnino world premieres two films at Venice: the doc feature “Salvatore: Shoemaker of Dreams,” about extraordinary Italian luxury shoe designer-entrepreneur Salvatore Ferragamo, and a more