We had our first stint behind the wheel of the 2019 Cadillac XT4; the refreshed 2020 Audi R8 Spyder was spied; and the 2019 Genesis G70 was priced. It’s the Week in Reverse, right here at ‘Motor Authority.’ Cadillac’s late to the compact crossover SUV market, but it finally has a contender with the 2019 XT4. We slid behind the wheel of the…