By Rachel More BERLIN, Jan 7 (Reuters) - More than 30 companies across the automotive supply ​chain have agreed to collaborate on open-source ‌software to develop next-generation cars and cut costs, the German ‌industry lobby behind the initiative said on Wednesday. Germany's VDA announced the expansion of the initiative at the CES trade show in Las Vegas, where ⁠carmakers and suppliers ‌are betting on AI and software to revive an industry struggling with slow ‍progress and high costs. European auto gr ...