use serilog along with microsoft logger, rework config handling

Azaion.Annotator/MainWindow.xaml.cs

@@ -22,7 +22,7 @@ public partial class MainWindow
     private readonly IMediator _mediator;
     private readonly FormState _formState;
 
-    private readonly Config _config;
+    private readonly IConfigRepository _configRepository;
     private readonly HelpWindow _helpWindow;
     
     public ObservableCollection<AnnotationClass> AnnotationClasses { get; set; } = new();
@@ -30,6 +30,7 @@ public partial class MainWindow
 
     private readonly TimeSpan _thresholdBefore = TimeSpan.FromMilliseconds(100);
     private readonly TimeSpan _thresholdAfter = TimeSpan.FromMilliseconds(300);
+    private readonly Config _config;
 
     public Dictionary<TimeSpan, List<YoloLabel>> AnnotationsDict { get; set; } = new();
     private IntervalTree<TimeSpan, List<YoloLabel>> Annotations { get; set; } = new();
@@ -37,7 +38,7 @@ public partial class MainWindow
     public MainWindow(LibVLC libVLC, MediaPlayer mediaPlayer,
         IMediator mediator,
         FormState formState,
-        Config config,
+        IConfigRepository configRepository,
         HelpWindow helpWindow)
     {
         InitializeComponent();
@@ -45,7 +46,8 @@ public partial class MainWindow
         _mediaPlayer = mediaPlayer;
         _mediator = mediator;
         _formState = formState;
-        _config = config;
+        _configRepository = configRepository;
+        _config = _configRepository.Get();
         _helpWindow = helpWindow;
         
         VideoView.Loaded += VideoView_Loaded;
@@ -232,7 +234,7 @@ public partial class MainWindow
         _mediaPlayer.Dispose();
         _libVLC.Dispose();
         _config.AnnotationClasses = AnnotationClasses.ToList();
-        _config.Save();
+        _configRepository.Save(_config);
         Application.Current.Shutdown();
     }