Before there was World of Warcraft ... and weekends spent WOW-ing, before there was Grand Theft Auto that your parents banned you from ever playing, there was  ... ATARI.   Leonardo DiCaprio will star in and produce "Atari," a project about the godfather of the video game industry, Nolan Bushnell.   Nolan was an  engineering student, puzzle-lover and early game enthusiast who went from fixing broken pinball machines to launching Atari Corp., a video game manufacturer, in the early '70s.   Its first product was a little game called Pong (ask your parents what it was --- you won't believe the answer:))  that transfixed kids in suburban rec rooms across the country and led to --well the world of computer gaming we live in today.   We've kitted him out in Space Invader couture -- a follow-up to Pong sho's graphic signature has inspired fashion labels such as 55DSL, Junk de Luxe and Steve Madden.  Now with Leo on board ... the Invasion continues!