Refactor array to avoid having to include external types

codegen/array/snippets/array_set

@@ -1,5 +1,6 @@
-  if (!array || index >= array->count) {{
+  {T} *ptr = wapp_{Tlower}_array_get(array, index);
+  if (!ptr) {{
     return;
   }}
 
-  array->items[index] = item;
+  memcpy((void *)ptr, (void *)item, array->item_size);