Global Autonomous Tractor Market Assessment, By Automation [Fully Autonomous, Semi-autonomous], By Horsepower [Up to 30 HP, 31 to 100 HP, More than 100 HP], By Component [Camera/Vision Systems, Lidar, Radar, GPS Systems, Ultrasonic Sensors, Hand-held Devices], By Application [Tillage, Seed Sowing, Harvesting, Others], By Region, Opportunities and Forecast, 2017-2031F