Sheikh Hamad bin Khalifa Al Thani, who as ruler of Qatar transformed the tiny Gulf nation into a global player in diplomacy, media and investment, and then shattered tradition by voluntarily turning over power to his son, has died, state media reported. He was 74. The state-run Qatar News Agency reported his death. It offered no cause. Sheikh Hamad, who stepped down in June 2013 after 18 years as emir, was the architect of energy-rich Qatar’s stunning ambitions that turned it from a backwater...