Joe Franklin, a pioneering host of talk shows on both radio and TV whose spotlight helped jumpstart careers for many notable performers, died Saturday, at the age of 88, of cancer. He had been fighting the disease for several years, a friend said. Franklin is credited with creating what’s become the standard talk-show trope – an urbane and curious host behind a desk, interviewing a range of the famous, the interesting and those somewhere in between. He started in TV in…