Installed Surge, fixed compile errors, moved a bunch of external stuff into folder

Assets/External/Pixelplacement/Surge/Singleton/Singleton.cs

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+/// <summary>
+/// SURGE FRAMEWORK
+/// Author: Bob Berkebile
+/// Email: bobb@pixelplacement.com
+/// 
+/// A generic singleton.
+/// 
+/// </summary>
+
+using System;
+using UnityEngine;
+using System.Collections;
+
+namespace Pixelplacement
+{
+    [RequireComponent(typeof(Initialization))]
+    public abstract class Singleton<T> : MonoBehaviour
+    {
+        //Public Properties:
+        /// <summary>
+        /// Gets the instance.
+        /// </summary>
+        public static T Instance
+        {
+            get
+            {
+                if (_instance == null)
+                {
+                    Debug.LogError("Singleton not registered! Make sure the GameObject running your singleton is active in your scene and has an Initialization component attached.");
+                    return default(T);
+                }
+                return _instance;
+            }
+        }
+
+        //Private Variables:
+        [SerializeField] bool _dontDestroyOnLoad = false;
+        static T _instance;
+
+        //Virtual Methods:
+        /// <summary>
+        /// Override this method to have code run when this singleton is initialized which is guaranteed to run before Awake and Start.
+        /// </summary>
+        protected virtual void OnRegistration()
+        {
+        }
+
+        //Public Methods:
+        /// <summary>
+        /// Generic method that registers the singleton instance.
+        /// </summary>
+        public void RegisterSingleton(T instance)
+        {
+            _instance = instance;
+        }
+
+        //Private Methods:
+        protected void Initialize(T instance)
+        {
+            if (_dontDestroyOnLoad && _instance != null)
+            {
+                //there is already an instance:
+                Destroy(gameObject);
+                return;
+            }
+
+            if (_dontDestroyOnLoad)
+            {
+                //don't destroy on load only works on root objects so let's force this transform to be a root object:
+                transform.parent = null;
+                DontDestroyOnLoad(gameObject);
+            }
+
+            _instance = instance;
+            OnRegistration();
+        }
+    }
+}