rewrite remove duplicates to support removing duplicates in albums tracks efficiently

+ remove flags added to client settings page
+ misc

app/print_help.py

@@ -10,19 +10,14 @@ Usage: swingmusic [options]
 Options:
     {', '.join(args.help)}: Show this help message
     {', '.join(args.version)}: Show the app version
-    
+
     {args.host}: Set the host
     {args.port}: Set the port
     {args.config}: Set the config path
-    
-    {', '.join(args.show_feat)}: Do not extract featured artists from the song title
-    {', '.join(args.show_prod)}: Do not hide producers in the song title
-    {', '.join(args.dont_clean_albums)}: Don't clean album titles. Cleaning is done by removing information in 
-                             parentheses and showing it separately
-    {', '.join(args.dont_clean_tracks)}: Don't remove remaster information from track titles
+
     {', '.join(args.no_periodic_scan)}: Disable periodic scan
     {', '.join(args.periodic_scan_interval)}: Set the periodic scan interval in seconds. Default is 300 seconds (5 
     minutes)
-    
+
     {args.build}: Build the application (in development)
 """