By Tim Kelly and Gilles Guillaume TOKYO/PARIS (Reuters) -Renault and Nissan will work more closely together to make electric cars, they said on Thursday, as they detailed a $26 billion investment plan over the next five years to stay competitive in the switch to cleaner driving. The two-decade old alliance, which also includes Mitsubishi Motors, said it would increase the number of common platforms for electric vehicles (EV) to five from four. They will build a combined EV line-up of 35 vehicles by 2030, the companies said, adding that by 2026 four fifths of their models would share common pla…