refactor and remove dependency circles

src/index.js

@@ -26,3 +26,7 @@ export { DeleteStore, DSNode } from './utils/DeleteStore.js'
 export { deleteItemRange } from './utils/structManipulation.js'
 export { integrateRemoteStruct, integrateRemoteStructs } from './utils/integrateRemoteStructs.js'
 export { isParentOf } from './utils/isParentOf.js'
+
+export { stringifyItemID } from './utils/structStringify.js'
+
+export * from './utils/structReferences.js'