add SettingsValueOption

Pilz.Configuration/SettingsValueOptionJsonConverter.cs

@@ -0,0 +1,27 @@
+using Newtonsoft.Json;
+using System;
+
+namespace Pilz.Configuration;
+
+public class SettingsValueOptionJsonConverter : JsonConverter
+{
+    public override bool CanConvert(Type objectType)
+    {
+        return true;
+    }
+
+    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+    {
+        if (existingValue is ISettingsValueOptionValueAccessor option)
+            option.ValueRaw = reader.Value;
+        return existingValue;
+    }
+
+    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+    {
+        if (value is ISettingsValueOptionValueAccessor option)
+            writer.WriteValue(option.ValueRaw);
+        else
+            writer.WriteNull();
+    }
+}