changelog:
-fixed bug where logs, cordwood, beams and lumber could not be unloaded at the firewood depot
-fixed bug where freight could not be transfered into other cars
-increased freight spawn distance: freight does spawn 260cm from car center when unloading is started
-freight can be unloaded anytime from cars; exceptions: wrong delivery platform, other car is full, other car is of wrong type, other car is of correct type but is loaded with a different freight
-added unloading arrow, the arrow shows exactly where the freight will be unloaded;
note: the unloading arrow should hover above the unloading platform/car you want to unload, if you try to unload and have one of the above mentioned exceptions the arrow will not show up and unloading will be blocked