Enable processing of For Loops.

Axiom.Core/Interpreter/CapturedCode.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace Axiom.Interpreter
+{
+  public class CapturedCode
+  {
+      private readonly byte[] codeBytes;
+
+      public CapturedCode(byte[] codeBytes)
+      {
+          this.codeBytes = codeBytes ?? throw new ArgumentNullException(nameof(codeBytes));
+      }
+      public int Length => codeBytes.Length;
+
+      public byte[] Bytes => (byte[])codeBytes;
+  }
+}