Implement sound-playing API

There's no playSoundEffect-equivalent method in the actual client code.
Instead, the client just adds some values to the 4 sfx arrays, removes
any old queued sound effects, and then bumps the counter, which is what
I've done as well.

runelite-api/src/main/java/net/runelite/api/Client.java

@@ -177,5 +177,24 @@ public interface Client extends GameEngine
 	List<Projectile> getProjectiles();
 
 
+	/**
+	 * Play a sound effect at the player's current location.
+	 * This is how UI, and player-generated (e.g. mining, woodcutting) sound effects are normally played
+	 *
+	 * @param id the ID of the sound to play
+	 */
+	void playSoundEffect(int id);
+
+	/**
+	 * Play a sound effect from some point in the world.
+	 *
+	 * @param id the ID of the sound to play
+	 * @param x the ground coordinate on the x axis
+	 * @param y the ground coordinate on the y axis
+	 * @param range the number of tiles away that the sound can be heard from
+	 */
+	void playSoundEffect(int id, int x, int y, int range);
+
+
 	BufferProvider getBufferProvider();
 }