replace sent/received bit panels

Panels/CodePanel.js

@@ -0,0 +1,11 @@
+import BasePanel from './BasePanel';
+
+class CodePanel extends BasePanel {
+  constructor(title) {
+    super(title);
+    this.addCode('code');
+  }
+  setCode = (html) => this.setHtmlById('code', html);
+}
+
+export default CodePanel;