Moved radar collections to C5

Bit of an experiment.  The C5 collections are still better designed
than the .Net ones, even on 3.5.  For instance, List(T) has a Find
method, but IList(T) doesn't.  List(T).AsReadOnly returns an IList,
which means you can't do .Find on it. So if you'd like to have that,
you have to forget about the safety net of AsReadOnly, and end up
writing to the implementation.

C5 allows us to return a GuardedList that behaves consistent with
what you would expect from List, and on top of that the collection
gets us other features.

Behaviors/Radar.cs

@@ -1,5 +1,5 @@
 using System.Linq;
-using System.Collections.Generic;
+using C5;
 using UnityEngine;
 using UnitySteer;
 using UnitySteer.Helpers;
@@ -24,9 +24,10 @@ public class Radar: MonoBehaviour, ITick {
 	[SerializeField]
 	LayerMask _layersChecked;
 
+
 	IList<Collider> _detected;
-	List<Vehicle> _vehicles = new List<Vehicle>();
-	List<Obstacle> _obstacles = new List<Obstacle>();
+	IList<Vehicle> _vehicles = new ArrayList<Vehicle>();
+	IList<Obstacle> _obstacles = new ArrayList<Obstacle>();
 
 	ObstacleFactory _obstacleFactory = null;
 
@@ -51,7 +52,7 @@ public class Radar: MonoBehaviour, ITick {
 	public IList<Obstacle> Obstacles {
 		get {
 			ExecuteRadar();
-			return _obstacles.AsReadOnly();
+			return new GuardedList<Obstacle>(_obstacles);
 		}
 
 	}
@@ -80,7 +81,7 @@ public class Radar: MonoBehaviour, ITick {
 	public IList<Vehicle> Vehicles {
 		get {
 			ExecuteRadar();
-			return _vehicles.AsReadOnly();
+			return new GuardedList<Vehicle>(_vehicles);
 		}
 	}
 
@@ -154,7 +155,7 @@ void ExecuteRadar()
 
 	protected virtual IList<Collider> Detect()
 	{
-		return new List<Collider>();
+		return new ArrayList<Collider>();
 	}
 
 	protected virtual void FilterDetected()

Behaviors/RadarPing.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using C5;
 using UnityEngine;
 using UnitySteer.Helpers;
 
@@ -47,7 +47,8 @@ void OnDrawGizmos()
 	protected override IList<Collider> Detect()
 	{
 		var detected = Physics.OverlapSphere(Vehicle.Position, _detectionRadius, LayersChecked);
-		var list = new List<Collider>(detected);
+		var list = new ArrayList<Collider>();
+		list.AddAll<Collider>(detected);
 		return list;
 	}
 	#endregion

C5/LICENSE.txt

@@ -0,0 +1,32 @@
+THE C5 GENERIC COLLECTION LIBRARY FOR C#/CLI
+
+Niels Kokholm and Peter Sestoft
+IT University of Copenhagen, Denmark
+
+See http://www.itu.dk/research/c5/
+and http://www.itu.dk/research/c5/Release1.0/ITU-TR-2006-76.pdf
+
+--------------------------------------------
+
+LICENSE
+
+Copyright (c) 2003-2007 Niels Kokholm and Peter Sestoft
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+--------------------------------------------