Enaml-web

- Use observe from enaml to avoid unecessary notifications during init_widget
- Improve speedup code

- Support python 3.13
- Cleanup type errors and lint errors

- **BREAKING** remove the `before` key from `added` and moved modified `events`.
The index can be used instead.
- Add oldvalue to update events
- Speedup looking up the index when adding child nodes
- Fix block insertion into another block that has a `block` set
- Cleanup some uncecesesary code
- Use etree.tostring instead of html.tostring to speed up render
- Add destroy methods
- Drop usage of atomref

- Include new index in added and moved modification events
- Fix bug where pattern nodes caused nodes to be inserted in the incorrect order

- Fix error when `Raw` node source is empty string.
- Make ext optional

- Allow `Raw` node to accept an etree element for the it's source.