Ipyelk

- Migrated to `ipywidgets >=8.0.1,<9`
- Added simple visualizer widget for the diagram pipe status.
- Fixed edge parent ownership affecting self edges ([101])

[94]: https://github.com/jupyrdf/ipyelk/issues/94
[97]: https://github.com/jupyrdf/ipyelk/issues/97
[101]: https://github.com/jupyrdf/ipyelk/issues/101

- Label Schema fix ([73])
- Element API overhaul ([88])
- Add `mypy` for type checking
- Use `pydantic` for `Element` base models
- Overhaul top level interface ([89])
- Backporting Sprotty Duplicate ID ([17])
- Generalize the processing stages to use a common interface of Marks and simplify
processing to composable pipes
- Refactoring top level APIs and attempt and more streamlined `Diagram` creation

[17]: https://github.com/jupyrdf/ipyelk/issues/17
[87]: https://github.com/jupyrdf/ipyelk/pull/87
[88]: https://github.com/jupyrdf/ipyelk/pull/88
[89]: https://github.com/jupyrdf/ipyelk/issues/89

- supports (and depends on) JupyterLab 3 ([6])
- labextension is delivered as part of the `ipyelk` python package, no more
`lab build`
- `npm` tarballs will still be uploaded

[6]: https://github.com/jupyrdf/ipyelk/issues/6

- Custom shapes ([60])
- Ability to add custom SVG symbols and use as a reference for other elements
- Custom node shapes
- Custom connector end shapes for edges
- Custom shapes for ports
- Custom node label shapes
- JupyterLab widgets rendering inside Node
- Node compartments
- Initial level of detail checks for labels
- Rendering checks for nodes outside of view bounding box
- Initial [documentation] ([64])

[documentation]: https://ipyelk.readthedocs.org
[60]: https://github.com/jupyrdf/ipyelk/pull/60
[64]: https://github.com/jupyrdf/ipyelk/pull/64