Made repository methods asynchronous. Simplified playlist repository. Use playlist manager in the app, and left playlist repository to only be used by the playlist manager.

Harmonia.Core/Data/XMLFileRepository.cs

@@ -2,20 +2,20 @@
 
 namespace Harmonia.Core.Data;
 
-public abstract class XMLFileRepository<TObject> : FileRepository<TObject> where TObject : notnull, new()
+public abstract class XmlFileRepository<TObject> : FileRepository<TObject> where TObject : notnull, new()
 {
     private readonly XmlSerializer _serializer = new(typeof(TObject));
 
     protected override string Extension => "xml";
 
-    protected override TObject Deserialize(Stream stream)
+    protected override async Task<TObject> DeserializeAsync(Stream stream)
     {
         using TextReader textReader = new StreamReader(stream);
 
         return (TObject?)_serializer.Deserialize(textReader) ?? new();
     }
 
-    protected override string Serialize(TObject obj)
+    protected override async Task<string> SerializeAsync(TObject obj)
     {
         using TextWriter textWriter = new StringWriter();