Sell cars

First public release.

•New SELL CAR entry in the garage action menu (Garage > My Cars > a car), right after *Remove car*. *Remove car* itself is unchanged.

•Choosing it opens a small menu with the price in its title and two entries, SELL CAR and BACK, selectable with the controller and clickable with the mouse (if you have FH2Mouse).

•Sale price = 50% of the model's base price + 30% of what was paid for the car's upgrades (both configurable in SellCar.ini).

•Update checks through the platform (the title screen tells you about a new release).