The world owes a great deal to minor Simpsons characters, and I have taken it upon myself to periodically-yet-irregularly celebrate them as the spirit moves me. Today we honor Martin Prince. Remember that John Mulaney routine where he says that "all little boys are a little bit gay...they're sort of floaty and have hard opinions about things"? Martin Prince is that wonderful, fey little boy. He has not yet learned to appear as if he…