With a little help, we now have VerseKey

Went with a basic wrapper that cxx is able to handle for the bridge
between the languages, along with simple wrapper methods

src/cxx/module.h

@@ -1,9 +1,11 @@
 #pragma once
 
+#include <memory>
 #include <sword/swmodule.h>
 #include <string>
 
 #include "rust/cxx.h"
+#include "versekey.h"
 
 namespace sword_rs {
     class Module {
@@ -19,6 +21,8 @@ namespace sword_rs {
 
             rust::String get_type() const;
 
+            VerseKey* get_verse_key() const;
+
             void increment();
 
             bool is_skip_consecutive_links() const;