Hoop station door collision

I've added collision meshes for the doors of the hoop station. I had to switch to dae since obj doesn't support animations, which adds a bit to the file size, but not much.
They work, but I'm a bit puzzled if they actually move, or the on rails docking sequence just ignores any collision while landing. They don't move on the model viewer, but if I recall correctly, collision animation doesn't show up there.
Fixes #2338