Imagine leaving a boy with autism secluded in a small cement room with a window too high for him to reach, as he bangs his head against the wall, screams and cries for hours, and wets his pants. That’s what his school in Central Jersey did, a lawyer told NJ Advance Media. “He was saying, ‘I’m hungry and I need water.’ He was just in there for most of the school day,” said the attorney, Renay Zamloot. Think, too, of how it must have felt for five-year-olds in Montclair, hearing a kid screaming next door for 30 minutes on a regular basis, begging to be let out ofthat school’s quiet room. “My kin…