Allowing users to switch playback before the end of a parse.

Opus/Code/Api/Services/MusicPlayer.cs

@@ -464,6 +464,7 @@ namespace Opus.Api.Services
                 Queue.instance?.Refresh();
                 Player.instance?.RefreshPlayer();
                 currentID = 0;
+                SongParser.Cancel(0);
                 await new SongParser().ParseSong(song, 0, true);
             }
             else

Opus/Code/Api/SongParser.cs

@@ -251,6 +251,15 @@ namespace Opus.Api
             return song;
         }
 
+        /// <summary>
+        /// Will stop the parsing for a slot of the queue. Use this when the user wants to play something else before the end of a parsing (Want to play something on the same queue slot but not the same song has the one being parsed now).
+        /// </summary>
+        /// <param name="queuePosition"></param>
+        public static void Cancel(int queuePosition)
+        {
+            instances.Where(x => x.queuePosition == queuePosition).FirstOrDefault()?.Cancel();
+        }
+
         /// <summary>
         /// This method will remove playback calls and get requests from the 
         /// </summary>