Add WVec.ToCVec() extension method.

OpenRA.Game/CPos.cs

@@ -72,8 +72,9 @@ namespace OpenRA
 		public static CPos BottomRightAsCPos(this Rectangle r) { return new CPos(r.Right, r.Bottom); }
 	}
 
-	public static class WPosExtensions
+	public static class WorldCoordinateExtensions
 	{
 		public static CPos ToCPos(this WPos a) { return new CPos(a.X / 1024, a.Y / 1024); }
+		public static CVec ToCVec(this WVec a) { return new CVec(a.X / 1024, a.Y / 1024); }
 	}
 }