Jake Kanter International TV EditorThe outgoing director general of the BBC will use one of his final speeches as a clarion call for the British broadcaster’s importance in a world ravaged by misinformation.Before stepping down next month after seven years in the top job, Tony Hall will tell the Edinburgh TV Festival on Monday that fake news is as rife as coronavirus, and the BBC’s public service values “have never been more needed.”Reflecting on an interview he conducted with WHO executive