Wim Wenders says not enough films are about healing, so for his “Every Thing Will Be Fine” at the Berlin film festival, he got James Franco to play a writer who runs over a child and has to deal with the emotional trauma. The veteran German director of “Paris, Texas” said he filmed his latest muted and somber film in 3D because it allowed him visually to explore the depths of his characters, including Franco as the successful novelist Tomas, who accidentally kills a boy whose sled careens into the street.