By Yew Lun Tian and Tony Munroe BEIJING (Reuters) – China’s Xi Jinping secured a precedent-breaking third leadership term on Sunday and introduced a top governing body stacked with loyalists, cementing his place as the country’s most powerful ruler since Mao Zedong. Shanghai Communist Party chief Li Qiang followed Xi onto the stage at the Great Hall of the People as the new Politburo Standing Committee was introduced, putting him in line to become premier when Li Keqiang retires in March. The other members of the seven-man Standing Committee are Zhao Leji and Wang Huning, who return from the p…