A new set of leaked photos shared by Mac Otakara are claiming to show engineering prototypes of a new 18-watt USB-C charger that Apple may be designing for fast charging iPhones. Reports earlier this year suggested that Apple would be including a USB-C charger and USB-C to Lightning cable in the box with this year’s iPhone models, replacing the relatively anemic five-watt charger that has been bundled with iPhones since 2008. An 18-watt USB-C…