Basic service entity completed and tested.

added UML to guide actual implementation for Host.

ModuleLoader, ServiceGateway, are written but untested.

src/GameServiceWarden.Host/Preferences/GeneralPreferences.cs

@@ -0,0 +1,46 @@
+using System;
+using System.IO;
+using System.Net;
+using System.Reflection;
+using System.Xml.Serialization;
+
+namespace GameServiceWarden.Host.Preferences
+{
+    [Serializable]
+    public class GeneralPreferences : IPersistable
+    {
+        //XML serialization invariants.
+        private readonly XmlSerializer xmlSerializer;
+        private readonly string APP_DATA_DIR;
+
+        //Preferences stored.
+        public int Port = 8080;
+        public string ListeningIP = IPAddress.Any.ToString();
+        public string ModuleDataPath;
+
+        public GeneralPreferences()
+        {
+            APP_DATA_DIR = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + "/" + Assembly.GetAssembly(GetType()).GetName().Name + "/";
+            xmlSerializer = new XmlSerializer(GetType());
+
+            this.ModuleDataPath = APP_DATA_DIR + "modules/";
+            Load();
+        }
+
+        public void Save()
+        {
+            using (FileStream writer = new FileStream(APP_DATA_DIR + GetType().Name + ".xml", FileMode.OpenOrCreate))
+            {
+                xmlSerializer.Serialize(writer, this);
+            }
+        }
+        
+        public void Load()
+        {
+            using (FileStream reader = new FileStream(APP_DATA_DIR + GetType().Name + ".xml", FileMode.Open))
+            {
+                xmlSerializer.Deserialize(reader);
+            }
+        }
+    }
+}

src/GameServiceWarden.Host/Preferences/IPersistable.cs

@@ -0,0 +1,8 @@
+namespace GameServiceWarden.Host.Preferences
+{
+    public interface IPersistable
+    {
+        public void Save();
+        public void Load();
+    }
+}