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/socket.io/modules.js

@@ -341,20 +341,8 @@ SocketModules.chats.getMessages = function (socket, data, callback) {
 };
 
 /* Sounds */
-SocketModules.sounds.getSounds = function (socket, data, callback) {
-	// Read sounds from local directory
-	meta.sounds.getFiles(callback);
-};
-
-SocketModules.sounds.getMapping = function (socket, data, callback) {
-	meta.sounds.getMapping(socket.uid, callback);
-};
-
-SocketModules.sounds.getData = function (socket, data, callback) {
-	async.parallel({
-		mapping: async.apply(meta.sounds.getMapping, socket.uid),
-		files: async.apply(meta.sounds.getFiles)
-	}, callback);
+SocketModules.sounds.getUserSoundMap = function getUserSoundMap(socket, data, callback) {
+	meta.sounds.getUserSoundMap(socket.uid, callback);
 };
 
 module.exports = SocketModules;