New: Use System.Text.Json for Nancy and SignalR

src/NzbDrone.Common/Serializer/System.Text.Json/STJVersionConverter.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace NzbDrone.Common.Serializer
+{
+    public class STJVersionConverter : JsonConverter<Version>
+    {
+        public override Version Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            if (reader.TokenType == JsonTokenType.Null)
+            {
+                return null;
+            }
+            else
+            {
+                if (reader.TokenType == JsonTokenType.String)
+                {
+                    try
+                    {
+                        Version v = new Version(reader.GetString());
+                        return v;
+                    }
+                    catch (Exception)
+                    {
+                        throw new JsonException();
+                    }
+                }
+                else
+                {
+                    throw new JsonException();
+                }
+            }
+        }
+
+        public override void Write(Utf8JsonWriter writer, Version value, JsonSerializerOptions options)
+        {
+            if (value == null)
+            {
+                writer.WriteNullValue();
+            }
+            else
+            {
+                writer.WriteStringValue(value.ToString());
+            }
+        }
+    }
+}