Former Editor-in-Chief Ryan Avent writes a weekly column about neighborhood and development issues. This week, I (carefully) picked up and began reading The Power Broker, the epic (and massive) Robert Caro biography of infamous New York master builder Robert Moses. Bob Moses, it turns out, was one of the best-trained civil service experts of the age when he first began working for the city. He was, as Caro describes him, a consummate idealist, passionately dedicated…