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

Assets/External/Pixelplacement/Surge/Tween/TweenActions/ShakePosition.cs

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+/// <summary>
+/// SURGE FRAMEWORK
+/// Author: Bob Berkebile
+/// Email: bobb@pixelplacement.com
+/// </summary>
+
+using UnityEngine;
+using System;
+using Pixelplacement;
+
+namespace Pixelplacement.TweenSystem
+{
+    class ShakePosition : TweenBase
+    {
+        //Public Properties:
+        public Vector3 EndValue {get; private set;}
+        
+        //Private Variables:
+        Transform _target;
+        Vector3 _initialPosition;
+        Vector3 _intensity;
+        
+        //Constructor:
+        public ShakePosition (Transform target, Vector3 initialPosition, Vector3 intensity, float duration, float delay, AnimationCurve curve, Action startCallback, Action completeCallback, Tween.LoopType loop, bool obeyTimescale)
+        {
+            //set essential properties:
+            SetEssentials (Tween.TweenType.Position, target.GetInstanceID (), duration, delay, obeyTimescale, curve, loop, startCallback, completeCallback);
+            
+            //catalog custom properties:
+            _target = target;
+            _initialPosition = initialPosition;
+            _intensity = intensity;
+        }
+        
+        //Processes:
+        protected override bool SetStartValue ()
+        {
+            if (_target == null) return false;
+            return true;
+        }
+        
+        protected override void Operation (float percentage)
+        {
+            if (percentage == 0)
+            {
+                _target.localPosition = _initialPosition;
+            }
+
+            percentage = 1 - percentage;
+
+            //create diminishing shake offset:
+            Vector3 amount = _intensity * percentage;
+            amount.x = UnityEngine.Random.Range (-amount.x, amount.x);
+            amount.y = UnityEngine.Random.Range (-amount.y, amount.y);
+            amount.z = UnityEngine.Random.Range (-amount.z, amount.z);
+
+            //apply:
+            _target.localPosition = _initialPosition + amount;
+        }
+        
+        //Loops:
+        public override void Loop ()
+        {
+            ResetStartTime ();
+            _target.localPosition = _initialPosition;
+        }
+        
+        public override void PingPong ()
+        {
+        }
+    }
+}