SPRINGFIELD — The state’s top court will hear more than a dozen cases starting Tuesday, including ruling whether a term-of-years sentence is unconstitutional and reviewing a Chicago ordinance that keeps food trucks at least 200 feet away from restaurants.People v. Dimitri BufferThe state Supreme Court will look at whether a 50-year sentence for a 16-year-old is an unconstitutional term of life in prison.In the case, which will be heard Tuesday, a teenager was convicted on four counts of first-degree murder …