Create a render ast node type.

src/intermediate/element.rs

@@ -27,7 +27,7 @@ use super::ITable;
 use super::IVerseBlock;
 use futures::future::{BoxFuture, FutureExt};
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub(crate) enum IElement {
     Paragraph(IParagraph),
     PlainList(IPlainList),