World leaders and everyday Britons on Friday voiced their support for Catherine, Princess of Wales, after her announcement that she had been diagnosed with cancer and was in the early stages of chemotherapy.Catherine said in a video address that the news of her diagnosis came as a “huge shock” to her family, as she asked for “time, space and privacy” following months of concerns, memes and rumors about her health and whereabouts.Contrary to some of the glib and conspiratorial chatter online in recent months, the reaction to her diagnosis was widely supportive.British Prime Minister…