Added "itemFormatAdmin" config option. This new format is used over the default "itemFormat" when players have the permission "music.adminItem". Useful to hide song IDs to players which do not need it.
Added "preventVanillaMusic" config option. Disabled by default and available only for servers > 1.13, this option will "prevent" the vanilla music being played by asking clients to stop the sound every 5 seconds.