The gradual end of paying cash to cross the Delaware River to Pennsylvania from Central and North Jersey is starting Wednesday when drivers will be offered a third option to “pay by license plate” in addition to cash and E-Zpass at six Delaware River Joint Toll Bridge Commission bridges. The three ways to pay will eventually give way to two all-electronic methods, E-ZPass and toll-by-plate as the commission marches toward a cashless future that was announced last month. Starting on Wednesday, drivers using the commission’s bridges between Trenton-Morrisville (Route 1); I-78; Easton-Phillipsbur…