Notifications used in SàT.

All the sounds in this repository can be copied or redistribued freely. Note that the
licenses here apply only to this directory and specified files.

Here are the origins of the notifications:

music-box.mp3 comes from <https://freesound.org/people/breebles/sounds/487029/>, it is made
by "breebles" and is licensed under Creative Commons 0 License (CC0).

Creative Commons 0 License can be read at <https://creativecommons.org/publicdomain/zero/1.0/>