Viur-core

- fix: `Skeleton.write()` returns full skeleton (1421)
- fix: Hotfix for 1391: missing skeltype-check (1420)
- fix: Hotfix for decorator `skey` introduced by 1394 (1419)
- fix: Keep `None` in `BooleanBones` (1418)
- fix: Replace deprecated `ensureOwnModuleRootNode` with `rootnodeSkel` (1414)

- fix: `Tree.add_or_edit()` should require for parententry (1410)
- fix: Custom decorators do not work with `Method`-wrapper (1394)

- feat: Implement `CloneBehavior` + `CloneStrategy` for a bone-individual clone behavior (1401)
- fix: `conf.i18n.add_missing_translations` the right way (1409)
- fix: f-string not Python < 3.12 compatible
- fix: Load user in a deferred task (1406)
- fix: Make translations usable (1408)

- feat: Add missing `onAdd` and `onAdded` calls in `File` module and implement `set_image_meta` (1391)
- fix: `BooleanBone.refresh()` doesn't respect language (1407)
- fix: `FileBone.refresh()` should fix `serving_url` (1404)

- fix: Check for preflight requests in closed_systems (1382)
- fix: Email methods has been renamed (1395)
- fix: Improve and standardize `Script` module `vfuncs` (1388)
- fix: Improve error reporting for unknown `RelationalBone` kinds (1393)
- fix: Remove overwriting `action` from `deprecated` decorator (1389)
- fix: Use variable instead of custom name joining for public bucket (1397)
- refactor: `RelationalBone.refresh()` (1392)

- doc: Fix `SyntaxWarning: invalid escape sequence '\*'` (1372)
- feat: Provide `add_or_edit` root-only endpoint for importers (1380)
- feat: Provide default `index`-function for `Tree` and `Singleton` (1365)
- fix: `errors` not marked as a reserved word (1374)
- fix: `FileLeafSkel._inject_serving_url()` is the better choice (1362)
- fix: `SkelModule` not able to handle empty index definitions (1373)
- fix: Provide bone name with assertion message (1375)
- fix: Render bones which are `readOnly=True` not as `required=True` (1371)