The man, the myth, the legend. Photo: Robert Voets/CBS Spoilers ahead for “Act One of a Horror Film, ” the season-49 premiere of Survivor. World, meet your new RizGod. RizGod, meet the world. Tonight’s Survivor season-49 premiere was a strong opener, introducing nearly every contestant to the audience, explaining the eventual boot clearly, and showcasing all the emerging alliances. But it will likely be best remembered as the introduction of one Rizo Velovic. He is from Yonkers, works in “tech