Fix path_dir to actually be an angle, path item deletion and orientation of wagons

The occupation system as it is now will change. For each position, I will save the index in the train's path,
and implement a callback system. I need this because the occupation window system will not be enough to cover all use cases
(e.g. to make a train stop with it's center or back at a certain position, I need 3 different brake distances, which doesn't fit into the scheme)

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