Move over, Popeyes. There’s a new chicken sandwich in town worth lining up for. San Diego import Crack Shack, which just opened at Park MGM, will make you wonder how you ever got on without it. It’s so good, in fact, I found myself texting a colleague about the sheer deliciousness of it all during my first visit. “This should be illegal,” I wrote. “Winner of the chicken sandwich wars in my book,” he replied.