Wagtail-editorjs

Changes
* Change how blocks are initialized to add chooser support.
* Add chooser support for wagtail block features.
* Nested allowed attributes and allowed tags for structblocks will now be used.

Changes
* Mirror Wagtail's way of initializing a block using [`telepath.unpack`](https://github.com/wagtail/wagtail/blob/a09bba67cd58f519f3ae5bff32575e7ce9244031/client/src/controllers/BlockController.ts#L56) to get access to the javascript block instance's `setState` and `getState` method.

Additions
* Allow Wagtail `FieldBLock` and `StructBlock` to be easily registered as features.
* Tests

Additions
* Tippy tooltips
* Features can choose their own css to include on the frontend

Changes
* Github Script
* `{% editorjs_static "css" %}` or `{% editorjs_static "js" %}` for including the asets on the frontend
* Update README

This update adds a `button` feature, Wagtail 6.1 compatibility and more.

Additions

* Add gitignore exclusion for testapp media files
* Add testapp
* Add Github Actions workflow for tests
* Add tutorial for tunes
* Add `button` feature
* Add sortable for `images` feature
* Add buttons for editing/removing images from `images` feature
* Add hooks for `wagtail_fedit` library for the editor (does not matter if not installed)

Updates

* Update README
* Updates to CSS (frontend and admin)
* Updates to internal chooser-tool javascript
* Update `build_element` to receive the `data` for ModelInline features

Fixes

* Fixes to validation in formfield; check for version and timestamp.
* Fixes to chooserUrls for **Wagtail 6.1**
* Fixes to inline-links not using the target/rel attributes specified
* Fixes to parsing `can_have_attrs` for inline features
* Fixes to exception when rendering if tune gets removed from list but is present in data

* Added django frontend-capable widget using the `WidgetWithScript` concept. Wagtail is still a requirement.
* Fixes to frontend CSS
* FULL urls are now only available with the settings for it to `True`.