For the last two decades in Los Angeles, your football plans have either included the Bruins or Trojans, high school teams or little league. Maybe some sort of fantasy league. What it hasn’t included is the Rams, or any professional football team. And that changes tomorrow. Officials are expecting a packed house at the Coliseum to see a pre-season NFL game between the Los Angeles Rams and the Dallas Cowboys. And the owners of the team are banking on that 20-year omission, nostalgia, and team fervor to score for many years to come.