refactor: Refactor code and show different scripting example

- Refactored code so implementation can be shared between Server and
  DdonGameServer.
- Moved settings into settings module and implemented an example using a
  less structured scripting module interface.
- Created new ScriptableSettings class to assist with interacting with
  non-structured settings module.
- Created README.md files for suggestions and guidelines for module
  implementation.

Arrowgene.Ddon.Server/Scripting/ScriptModule.cs

@@ -0,0 +1,42 @@
+using Microsoft.CodeAnalysis.Scripting;
+using System.Collections.Generic;
+using System.IO;
+
+namespace Arrowgene.Ddon.GameServer.Scripting
+{
+    public abstract class ScriptModule
+    {
+        public abstract string ModuleRoot { get; }
+        public abstract string Filter { get; }
+        public abstract bool ScanSubdirectories { get; }
+        public FileSystemWatcher Watcher { get; set; }
+
+        /// <summary>
+        /// Determines if this module is able to be hot-loadable or not.
+        /// If a module is not hot-loadable, it will only be evaluated once
+        /// when the server first loads.
+        /// </summary>
+        public abstract bool EnableHotLoad { get; }
+
+        public HashSet<string> Scripts { get; set; }
+
+        public ScriptModule()
+        {
+            Scripts = new HashSet<string>();
+        }
+
+        /// <summary>
+        /// Options passed into the compilation unit.
+        /// </summary>
+        /// <returns></returns>
+        public abstract ScriptOptions Options();
+
+        /// <summary>
+        /// Evaluates the result returned by the script.
+        /// </summary>
+        /// <param name="path">Path to the script that was executed</param>
+        /// <param name="result">The result object of the script that executed</param>
+        /// <returns></returns>
+        public abstract bool EvaluateResult(string path, ScriptState<object> result);
+    }
+}