Bloomberg: Disney is the world’s most powerful brand, thanks to the likable robots R2-D2 and C-3P0, who propelled the entertainment company to the top spot following the box office success of ‘‘Star Wars VII: The Force Awakens,” London-based Brand Finance said. With Star Wars’ brand value alone estimated at $10 billion, Disney is reaping rewards from the $4 billion it paid for Lucasfilm in 2012.