FF - Import Shop Restart Fix

What it does:
  - Restocks empty shops on startup. About 10 seconds after the game starts, the mod checks every vehicle import shop. If your faction owns the location and the shop is empty, it generates a fresh stock, just
    like the normal daily refresh.
  - Fixes saved stock entries. When saved shop stock is loaded, the mod converts the item names back into a form the shop recognizes. Without that, the items lose their prices and can't be bought. Vehicles
    from mods that are no longer loaded get removed instead of breaking the shop.
  - Refreshes shops that already have stock. Shops that aren't empty get their stock pushed back to them, so they always show what they actually hold.

  Notes:
  - Requires Freedom Fighters.