Adding extension for rectangleitem to get position in Farseer units ( getSimPosition )

Adding extension for vector2 to convert back and forth between sim and display units

axios/Engine/Extensions/RectangleItemProperties.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Microsoft.Xna.Framework;
+using Gleed2D.InGame;
+using FarseerPhysics.SamplesFramework;
+
+namespace Axios.Engine.Extensions
+{
+    public static class AxiosExtensions_RectangleItemProperties
+    {
+        public static Vector2 getSimPosition(this RectangleItemProperties prop)
+        {
+            Vector2 pos = ConvertUnits.ToSimUnits(prop.Position);
+            pos.X += ConvertUnits.ToSimUnits(prop.Width / 2);
+            pos.Y += ConvertUnits.ToSimUnits(prop.Height / 2);
+            return pos;
+        }
+    }
+}

axios/Engine/Extensions/Vector2.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Microsoft.Xna.Framework;
+using Gleed2D.InGame;
+using FarseerPhysics.SamplesFramework;
+
+namespace Axios.Engine.Extensions
+{
+    public static class AxiosExtensions_Vector2
+    {
+        public static Vector2 toSimUnits(this Vector2 vec)
+        {
+            return ConvertUnits.ToSimUnits(vec);
+        }
+
+        public static Vector2 toDisplayUnits(this Vector2 vec)
+        {
+            return ConvertUnits.ToDisplayUnits(vec);
+        }
+    }
+}