For eight years now, the New York Asian Film Festival has earned “Wow”s and “Huh?”s from Manhattan audiences with its savory mix of action and art-house works from the continent that produces more movies than any other. In its scope and vigor, this is the New York film festival, and it’s run not by a heavily subsidized arts institution but by a few knowledgeable guys from Brooklyn who want to share their enthusiasms with the fanboys of the tristate area.