Add intermediate stage for text markup.

src/intermediate/verbatim.rs

@@ -1,6 +1,15 @@
+use super::macros::intermediate;
+
 use crate::error::CustomError;
 
-use super::macros::inoop;
+#[derive(Debug, Clone)]
+pub(crate) struct IVerbatim {
+    pub(crate) contents: String,
+}
 
-
-inoop!(IVerbatim, Verbatim);
+intermediate!(IVerbatim, Verbatim, original, _registry, {
+    Ok(IVerbatim {
+        // TODO: Should this coalesce whitespace like PlainText?
+        contents: original.contents.to_owned(),
+    })
+});