Movie review In the opening of Sophy Romvari’s “Blue Heron,” one of the most beautiful, quietly bold and flooring feature debuts of recent memory, we begin with a confession. We hear a woman, Amy Zimmer’s Sasha, recounting a lingering pain from her past: “I struggle now to remember much of my childhood,” she says. She then recalls, of her brother, that, “I do remember his maps.” This confession, bracingly honest and intentionally withholding, operates on multiple levels. In one reading, it is an artistic statement of what Romvari, drawing from her own life as she tells the story of a Hungarian Canadian family moving to a new home on Vancouver Island in the late 1990s, is now attempting to do. Much as she did in “Still Processing,” her emotionally shattering short film, she is looking deep into her past to find answers that may not be so easily uncovered.…