Playlist system creation

Added a way to deal with playlist. Also now autoscroll to keep new playing kara on top. Fixed wrong command name

common/db.js

@@ -47,6 +47,7 @@ class KaraDatabase {
     constructor() {
         this.m_karaPath = config.content.database.path;
         this.m_db = new sqlite3.Database(this.m_karaPath);
+        this.m_db.configure("busyTimeout", 50000)
         logger.info('db', 'Create database from file ' + config.content.database.path);
     }