V1.3 Big content update

Been working a while on this now and took a bit longer than expected, but here it is! This will most likely be the final version of Farming Simulator 1999 regarding features, but I will of course still be fixing bugs if any appear.

New features:

• Added an ending
• Added a revolver
• Changed the graphics
• Added a shed
• Added a new car
• Added twigs around the map
• Tweaked the fuel usage on the tractor