NEW YORK (AP) — In its debut film, Skydance Productions released a special effects-laden World War I drama about fighter pilots with a starring role for an unknown actor, the company’s founder, David Ellison. It was a box office bomb. Twenty years later, in a twist fit for Hollywood itself, the tiny studio once brushed off as a billionaire scion’s vanity project is poised to be an entertainment behemoth. With that once-unknown actor at its helm and a merger with Paramount already under its belt,