TRIPOLI — Youssef Jira, a fresh-faced 18-year-old in a hoodie, has big ambitions in a Libyan society where youthful creativity has long been sacrificed to dictatorship and violence.He wants to encourage other young people to use hi-tech to help modernise the divided and conflict-scarred country.Jira, with a bandana around his head, is one of a group of young tech fanatics who