Billy Burke knows he might be the most clueless father in history. As Bella’s pop in the “Twilight” saga, he never really has noticed that his daughter is, oh, dating a vampire. Hello! The luminous skin? The piercing gaze? The jumping on treetops? “I know, I know,” says actor Billy Burke. “He doesn’t know. My character Charlie does have to resign himself to being oblivious.” Especially now. In th…