Move JavaResourcePackConverter to its own cs proj

JavaResourcePackConverter/Java/SizeJsonConverter.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Drawing;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace JavaResourcePackConverter
+{
+    public class SizeJsonConverter : JsonConverter<Size>
+    {
+        public override void WriteJson(JsonWriter writer, Size value, JsonSerializer serializer)
+        {
+            JObject jo = new JObject();
+            jo.Add("width", value.Width);
+            jo.Add("height", value.Height);
+            jo.WriteTo(writer);
+        }
+
+        public override Size ReadJson(JsonReader reader, Type objectType, Size existingValue, bool hasExistingValue, JsonSerializer serializer)
+        {
+            JObject jo = JObject.Load(reader);
+            return new Size((int)(jo["width"] ?? 0), (int)(jo["height"] ?? 0));
+        }
+    }
+}