Sound system improvements

- Fix sound ACP uploads
- Display soundpack names with sound files
- Soundpacks can have sounds with identical names
- Link sounds during build step
- Generate map of sound name to file name during build step
- Change how soundpacks work. It's now done via a field in plugin.json

src/webserver.js

@@ -103,9 +103,9 @@ function initializeNodeBB(callback) {
 		},
 		function (next) {
 			async.series([
-				async.apply(meta.sounds.init),
-				async.apply(languages.init),
-				async.apply(meta.blacklist.load)
+				meta.sounds.addUploads,
+				languages.init,
+				meta.blacklist.load,
 			], next);
 		}
 	], callback);