By Eduardo Leal / AFP Mainland Chinese residents will be allowed to visit Macau using an online visa system as of Tuesday, officials said, streamlining travel to the world’s largest gambling hub after more than two years of pandemic restrictions. Mainland Chinese residents will be allowed to visit Macau using an online visa system as of Tuesday, officials said, streamlining travel to the world’s largest gambling hub after more than two years of pandemic restrictions. Macau is the only place in China where casinos are legal and the former Portuguese colony once dwarfed even Las Vegas for the sc…