Server-side track loading uses ghost objects

[kimden]

Ghost objects are supposed to be rendered for clients, while having no impact on physics.

I added a line into TrackObject::init that logs object's interaction and type, and ran client on one machine and server on another. Apparently the server side loads many ghost objects.

I'm not aware if they are extensively processed anywhere. But I tried preventing ghost objects from loading before (in a bad way and I didn't exactly know what I'm doing, so there's no commit and crashes were possible), in the late 2023 and now, and sometimes track loading time was reduced by 2-5 times, which is much.