Rewrite speaker networking code

Speakers now play sounds using a custom set of packets.
 - When playing a sound, we send the resource id, position, volume,
   pitch and a UUID for the _speaker_ to all nearby clients.
 - This UUID is then used when we need to update the sound. When the
   speaker is moved or destroyed, we send a new packet to clients and
   update accordingly.

This does have one side effect, that speakers can now only play one
sound at a time. I think this is accceptable - otherwise it's possible
to spam ward in a loop.

Notes still use the old networking code, and so will not be affected.

Closes #823

src/main/java/dan200/computercraft/client/SoundManager.java

@@ -0,0 +1,84 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.client;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.audio.ISound;
+import net.minecraft.client.audio.ITickableSound;
+import net.minecraft.client.audio.LocatableSound;
+import net.minecraft.client.audio.SoundHandler;
+import net.minecraft.util.SoundCategory;
+import net.minecraft.util.SoundEvent;
+import net.minecraft.util.math.Vec3d;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+public class SoundManager
+{
+    private static final Map<UUID, MoveableSound> sounds = new HashMap<>();
+
+    public static void playSound( UUID source, Vec3d position, SoundEvent event, float volume, float pitch )
+    {
+        SoundHandler soundManager = Minecraft.getInstance().getSoundManager();
+
+        MoveableSound oldSound = sounds.get( source );
+        if( oldSound != null ) soundManager.stop( oldSound );
+
+        MoveableSound newSound = new MoveableSound( event, position, volume, pitch );
+        sounds.put( source, newSound );
+        soundManager.play( newSound );
+    }
+
+    public static void stopSound( UUID source )
+    {
+        ISound sound = sounds.remove( source );
+        if( sound == null ) return;
+
+        Minecraft.getInstance().getSoundManager().stop( sound );
+    }
+
+    public static void moveSound( UUID source, Vec3d position )
+    {
+        MoveableSound sound = sounds.get( source );
+        if( sound != null ) sound.setPosition( position );
+    }
+
+    public static void reset()
+    {
+        sounds.clear();
+    }
+
+    private static class MoveableSound extends LocatableSound implements ITickableSound
+    {
+        protected MoveableSound( SoundEvent sound, Vec3d position, float volume, float pitch )
+        {
+            super( sound, SoundCategory.RECORDS );
+            setPosition( position );
+            this.volume = volume;
+            this.pitch = pitch;
+        }
+
+        void setPosition( Vec3d position )
+        {
+            x = (float) position.x();
+            y = (float) position.y();
+            z = (float) position.z();
+        }
+
+        @Override
+        public boolean isStopped()
+        {
+            return false;
+        }
+
+        @Override
+        public void tick()
+        {
+        }
+    }
+}