Device dialog - Added LEDs tab

General - Resolved lots of compile warnings (XML comments)

src/Artemis.UI.Shared/Converters/ToStringConverter.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Globalization;
+using Avalonia.Data.Converters;
+
+namespace Artemis.UI.Shared.Converters;
+
+/// <summary>
+/// Converts any object to string by calling its ToString implementation, seems Avalonia doesn't do this
+/// </summary>
+public class ToStringConverter : IValueConverter
+{
+    /// <inheritdoc />
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        return value?.ToString();
+    }
+
+    /// <inheritdoc />
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        return value;
+    }
+}