As one of the world’s largest indie film festivals gets underway in Park City, Utah, this week, Colorado filmmakers are the feeling the momentum of the state’s growing prestige in the international documentary scene. Part industry feeding frenzy, part cultural crystal-ball, the 32nd annual Sundance Film Festival has become arguably the best place in the world to debut a documentary, gathering press and distribution deals along the way. And while there are a relatively modest amount of documentaries produced or filmed in Colorado screening at Sundance this year — amid the more than 1,700 submissions (about half from America, and half international) — the state’s savvy, scrappy filmmakers, based in large part out of Boulder, are learning how to work the system. “There was a period when (2012’s) ‘Chasing Ice’ first came out when I was going to festivals and jokingly asking people if they were based in New York, L.A.