Made API models internal. Removed Discord.Net.API.

src/Discord.Net.Rest/Net/Converters/UInt64Converter.cs

@@ -0,0 +1,25 @@
+using Newtonsoft.Json;
+using System;
+using System.Globalization;
+
+namespace Discord.Net.Converters
+{
+    internal class UInt64Converter : JsonConverter
+    {
+        public static readonly UInt64Converter Instance = new UInt64Converter();
+
+        public override bool CanConvert(Type objectType) => true;
+        public override bool CanRead => true;
+        public override bool CanWrite => true;
+
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        {
+            return ulong.Parse((string)reader.Value, NumberStyles.None, CultureInfo.InvariantCulture);
+        }
+
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        {
+            writer.WriteValue(((ulong)value).ToString(CultureInfo.InvariantCulture));
+        }
+    }
+}