H-Shifter implementation (only tested with Logitech Driving Force Shifter for G29), in order to shift into gears higher than 6th gear, press the Range Button (D-Pad Left on the Steering Wheel or Right Shift on the Keyboard).
Fixed some textures on the 8x8 tanker truck.
There have been a lot of changes to the code for the gearbox and fixed some mistakes on the code for the engine RPM and torque.
