By Maki Shiraki and Sakura Murakami TOKYO (Reuters) - The Tokyo Tower and other landmarks were lit in special Olympic colours in April to mark 100 days before the Summer Games opened, but were shrouded in clouds of mist when rain enveloped the Japanese capital that night. Light and shadows are the hallmarks of these Games, the second time Tokyo is the host. (Open XXX in an external browser to see a picture package postcard from Tokyo.) Half a century earlier, in 1964, the Games heralded a new era of modernity for a city risen from the ashes of a war that had ended fewer than two decades before...