[MEMOxiiii]

Fixes jukebox music not stopping when the disc is taken out or the jukebox is broken, matching vanilla 1.26.50.

• Music discs are now played with a PlaySound packet that carries a sound handle, like vanilla does.
• Stopping a disc sends ClientboundUpdateSoundData with that handle, so the client stops the music. The old LevelSoundEvent RecordNull did not stop it.
• The handle is made from the jukebox position, so the stop packet can find the sound again without keeping any extra state. Vanilla uses a counter instead, but the client only needs the same handle in both packets.

Verified against BDS.

Before

before.mp4

After

after.mp4