Move VocLoader from D2k to Cnc

My assumption that the D2 mod would want,
let alone need Mods.D2k was wrong.
Meanwhile, it does need Mods.Cnc for at least
the Pak format as well, so this is a good enough
compromise.

OpenRA.Mods.Cnc/AudioLoaders/VocLoader.cs

@@ -15,7 +15,7 @@ using System.IO;
 using System.Linq;
 using OpenRA.Primitives;
 
-namespace OpenRA.Mods.D2k.AudioLoaders
+namespace OpenRA.Mods.Cnc.AudioLoaders
 {
 	public class VocLoader : ISoundLoader
 	{