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

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

@@ -0,0 +1,70 @@
+/// <summary>
+/// SURGE FRAMEWORK
+/// Author: Bob Berkebile
+/// Email: bobb@pixelplacement.com
+/// </summary>
+
+using UnityEngine;
+using System;
+using Pixelplacement;
+
+namespace Pixelplacement.TweenSystem
+{
+    class Rotate : TweenBase
+    {
+        //Public Properties:
+        public Vector3 EndValue {get; private set;}
+
+        //Private Variables:
+        Transform _target;
+        Vector3 _start;
+        Space _space;
+        Vector3 _previous;
+
+        //Constructor:
+        public Rotate (Transform target, Vector3 endValue, Space space, float duration, float delay, bool obeyTimescale, AnimationCurve curve, Tween.LoopType loop, Action startCallback, Action completeCallback)
+        {
+            //set essential properties:
+            SetEssentials (Tween.TweenType.Rotation, target.GetInstanceID (), duration, delay, obeyTimescale, curve, loop, startCallback, completeCallback);
+
+            //catalog custom properties:
+            _target = target;
+            EndValue = endValue;
+            _space = space;
+        }
+
+        //Processes:
+        protected override bool SetStartValue ()
+        {
+            if (_target == null) return false;
+            _start = _target.localEulerAngles;
+            return true;
+        }
+
+        protected override void Operation (float percentage)
+        {
+            if (percentage == 0)
+            {
+                _target.localEulerAngles = _start;
+            }
+            Vector3 spinAmount = TweenUtilities.LinearInterpolate (Vector3.zero, EndValue, percentage);
+            Vector3 spinDifference = spinAmount - _previous;
+            _previous += spinDifference;
+            _target.Rotate (spinDifference, _space);
+        }
+
+        //Loops:
+        public override void Loop ()
+        {
+            _previous = Vector3.zero;
+            ResetStartTime ();
+        }
+
+        public override void PingPong ()
+        {
+            _previous = Vector3.zero;
+            EndValue *= -1;
+            ResetStartTime ();
+        }
+    }
+}