Advocates are turning zoning reform into an important progressive cause — not just a housing issue — In communities across the country, the “Not In My Backyard” approach to housing is finally getting a much-needed remodel. In Oregon, the state legislature passed a bill earlier this month legalizing duplexes in cities with a population of more than 10,000 people; and duplexes, triplexes, fourplexes, townhomes, and “cottage clusters”…