Use macros for creating the intermediate stage.

This is to make it easier to change function signatures by consolidating the places where the signatures exist.

src/intermediate/verse_block.rs

@@ -1,15 +1,6 @@
 use crate::error::CustomError;
 
+use super::macros::inoop;
 use super::registry::Registry;
 
-#[derive(Debug, Clone)]
-pub(crate) struct IVerseBlock {}
-
-impl IVerseBlock {
-    pub(crate) async fn new<'b, 'parse>(
-        registry: &'b mut Registry<'parse>,
-        original: &'b organic::types::VerseBlock<'parse>,
-    ) -> Result<IVerseBlock, CustomError> {
-        Ok(IVerseBlock {})
-    }
-}
+inoop!(IVerseBlock, VerseBlock);