first commit

Nitrox.Launcher/Models/Converters/BitmapAssetValueConverter.cs

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+using System;
+using System.Globalization;
+using Avalonia.Media.Imaging;
+using Nitrox.Launcher.Models.Utils;
+
+namespace Nitrox.Launcher.Models.Converters;
+
+public class BitmapAssetValueConverter : Converter<BitmapAssetValueConverter>
+{
+    public override object Convert(object value, Type targetType, object parameter, CultureInfo culture) =>
+        value switch
+        {
+            null => null,
+            Bitmap when targetType.IsAssignableFrom(typeof(Bitmap)) => value,
+            string s when targetType.IsAssignableFrom(typeof(Bitmap)) => AssetHelper.GetAssetFromStream(s, static stream => new Bitmap(stream)),
+            _ => throw new NotSupportedException()
+        };
+}