NoteBlockAPI

Fixed compatibility with 1.21.3 (thanks to @DaJokni).

This version is still compatible with versions 1.8+.

Bug fixes:

• Fixed SongStoppedEvent fired when setPlaying(true, null) was called
• Various fixes for NoteBlocKSongPlayer
• Fixed ArrayIndexOutOfBoundsException after player's teleportation
• Fixed error on Purpur when stopping the server
• Fixed stereo offset distance calculation