DETROIT — One lawsuit seeks to replace lead-leaching water lines at no cost to customers. Another seeks money for thousands of Flint residents who unwittingly drank toxic water. A third complaint has been filed on behalf of people with Legionnaires’ disease.While government officials scramble to rid Flint’s tap water of lead, victims are suing Gov. Rick Snyder, the former mayor, rank-and-file public employees and almost anyone else who may have had a role in supplying the troubled city with corrosive river water for 18 …