feat: disintegrate block and collectible emitters, and audio changes

[teclu]

• Collectible 2 has its own emitter now.
• Collectibles now play their respective sounds when collected.

• Disintegrate block's destruction has an emitter now.
• Shifted the Audio Listener from the Main Camera and onto the player. This is to facilitate Collectible 2's Audio Source playing, where the volume is dependent on distance of the listener to the source.