New footstep effects and new Kart race track

[Admins]

Some new stuff on Kingdoms:
- new footstep effects, you can see footsteps of other people
- re-enabled the water bubbles when swimming
- replaced the horse race track with a new kart race track (the one from the main island will be removed sometime soon)
- removed the annoying walking sounds from the ice hockey animation

We will eventually change the footstep effects sometime to look better inside houses.