Shanghai, China CNN  —  This year’s Shanghai auto show has a clear message for visitors: China is now a global leader in innovation, and it wants the world to know. The massive, thrumming exhibition that took place in the country’s financial capital over the past two weeks boasted over 60 football fields of floorspace, packed full of carmakers using the event to unveil a raft of new models with curtain-pulling reveals. To a soundtrack of bass-thumping music, big brands showed off everything