More train sounds!

Added more life to the trains by creating and/or finding good sounds for multiple train ride elements:

- Screeching friction brakes

- Brake releases

- Highspeed brake

- Lowspeed brake

- Friction Wheels (Rubber wheels that moves the train after a dispatch for example)

Video of  some sound changes (they are louder than in-game on purpose in this video):

Overall balancing again for sounds.