Fix display, inform player of offline turrets, list non-hardcoded fuels

Fixed that display shifting bug when configuring turrets in a moving vehicle.

When vehicle turret system is turned on, but all its turrets are off, a warning is printed.

Fuel tanks containing substances that weren't hardcoded are now displayed below the hardcoded ones (so you can see an acid gauge, for example). Their colors are taken from the default ammo of their type. Non-ammo types not supported yet.