[Feature] PC Sound support

Adding sound playback by PC would be of course possible. Crossing bell could automatically play when a crossing closes, and train station sounds could also be context sensitive since the software knows if a train will brake or stop. Sounds triggered just via markers is also possible. _Originally posted by @Novakasa in https://github.com/Novakasa/brickrail/discussions/168#discussioncomment-7292952_