Gov. Bob Miller of Nevada joined entertainer Wayne Newton this week in trying to get a settlement in the summer-long dispute between hotels and musicians that has forced several stars to cancel their Las Vegas engagements. Miller’s entrance into the talks came a week after Newton brought the two sides back to the bargaining table to try and break the impasse that has darkened showrooms at three major resorts and seen picket lines at two others. “My position has been just to keep everybody talking,” said Newton, who lives in Las Vegas and is a big attraction in the hotel showrooms there. Last week, he refused to cross picket lines at the Las Vegas Hilton.