preparing serialization of entities

Juliet/include/Core/Common/serialization.h

@@ -1,13 +1,17 @@
 #pragma once
 
+#include <Juliet.h>
+
 struct Arena;
 
 struct archive
 {
-    Arena* arena;
-    bool   loading;
+    Arena*  arena;
+    void*   base_ptr;
+    index_t offset;
+    bool    loading;
 };
 
-void serialize(archive* ar, void* data, size_t size);
+JULIET_API void serialize(archive& ar, void* data, size_t size);
 
 #define serialize_elem(ar, val) serialize((ar), &(val), sizeof(val))