[Sug] PlayerSoundSmooth

[Blavaloff]

Create a flag for the player sound for a have a progesive volume of the sound in entry and exit of the region https://github.com/aromaa/WorldGuardExtraFlags/blob/master/WG/src/main/java/net/goldtreeservers/worldguardextraflags/wg/handlers/PlaySoundsFlagHandler.java