PARIS — An investigation has been launched in France into the death of a 46-year-old man who livestreamed videos of himself being subjected to abuse and violence.Raphael Graven — who went by Jean PormanovePARIS — An investigation has been launched in France into the death of a 46-year-old man who livestreamed videos of himself being subjected to abuse and violence.Raphael Graven — who went by Jean Pormanove