Removed NioTSO client and server

- NioTSO client isn't needed because we're using RayLib
- Added FreeSO's API server to handle most backend operations

server/tso.common/Utils/Base64JsonConverter.cs

@@ -0,0 +1,29 @@
+using System;
+using Newtonsoft.Json;
+
+namespace FSO.Common.Utils
+{
+    public class Base64JsonConverter : JsonConverter
+    {
+        public override bool CanConvert(Type objectType)
+        {
+            if (typeof(byte[]).IsAssignableFrom(objectType))
+            {
+                return true;
+            }
+            return false;
+        }
+
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        {
+            string data = (string)reader.Value;
+            return Convert.FromBase64String(data);
+        }
+
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        {
+            byte[] bytes = (byte[])value;
+            writer.WriteValue(Convert.ToBase64String(bytes));
+        }
+    }
+}