For a film about death, Lila Avilés’ “Tótem” is extraordinarily lived in. Avilés’ camera roams through the festive, cluttered gathering of an extended family as they prepare for a birthday celebration that evening. Watching it all is the 7-year-old Sol (Naíma Sentíes), whose father, Tonatiuh or “Tona” (Mateo Garcia), is to be feted.