* fold Stack into Editor
* switch Change objects to be tied to editors, not values
* introduce controller
* add the "commands" concept
* convert history into commands on `value.data`
* add the ability to not normalize on editor creation/setting
* convert schema to a mutable constructor
* add editor.command method
* convert plugin handlers to receive `next`
* switch commands to use the onCommand middleware
* add queries support, convert schema to queries
* split out browser plugin
* remove noop util
* fixes
* fixes
* start fixing tests, refactor hyperscript to be more literal
* fix slate-html-serializer tests
* fix schema tests with hyperscript
* fix text model tests with hyperscript
* fix more tests
* get all tests passing
* fix lint
* undo decorations example update
* update examples
* small changes to the api to make it nicer
* update docs
* update commands/queries plugin logic
* change normalizeNode and validateNode to be middleware
* fix decoration removal
* rename commands tests
* add useful errors to existing APIs
* update changelogs
* cleanup
* fixes
* update docs
* add editor docs
#### Is this adding or improving a _feature_ or fixing a _bug_?
Improvement.
#### What's the new behavior?
This introduces two new models: `Decoration` and `Selection`, which both implement the simpler `Range` interface. This way we can introduce properties to these concepts without having to have them live on all ranges, and we can start to introduce more helpful methods specific to each one's needs.
It also means we don't need to move `isFocused` to value, which saves some complexity on the operations side, retaining `set_selection` as the only way selections are modified.
In the process, it also cleans up a lot of the existing model logic for implementing the `Node` interface, and introduces another `Common` interface for shared properties of all Slate models.
#### How does this change work?
It introduces a new `interfaces/` directory where common sets of properties can be declared, and mixed in to the models with the new (simple) `mixin` utility.
#### Have you checked that...?
* [x] The new code matches the existing patterns and styles.
* [x] The tests pass with `yarn test`.
* [x] The linter passes with `yarn lint`. (Fix errors with `yarn prettier`.)
* [x] The relevant examples still work. (Run examples with `yarn watch`.)
#### Does this fix any issues or need any specific reviewers?
Fixes: #1952Fixes: #1807
Fixes: https://github.com/ianstormtaylor/slate/issues/2110
* Fix spell check bug by add data-text:true
* Fix spell check bug by spell check add length to a leaf
* Fix tests to use data-text:true for marks
* Rename data-text to data-slate-leaf; Remove setRef; unlift attributes in leaf
* Update examples with data-*
* Add attributes to document
* Fix renderMark in all documents
* Prettier markdown
* Add Prettier, with basic config and ESLint integration
* Apply Prettier to all files using `yarn lint --fix`
* Tell Prettier to ignore an empty text in a test output.
* Run Prettier on JS files not handled by ESLint, and lint them too
* rename state to value in slate core, as deprecation
* rename all references to state to value in slate core
* migrate slate-base64-serializer
* migrate slate-html-serializer
* migrate slate-hyperscript
* migrate slate-plain-serializer
* migrate slate-prop-types
* migrate slate-simulator
* fix change.setState compat
* deprecate references to state in slate-react
* remove all references to state in slate-react
* remove `value` and `schema` from props to all components
* fix default renderPlaceholder
* fix tests
* update examples
* update walkthroughs
* update guides
* update reference
* remove data from event handler signatures
* standardize known transfer types
* add setEventTransfer to docs
* update examples, fix drag/drop
* fix tests and draggable attribute setting
* refactor to extract applyOperation util
* change handlers to receive transform instead of state
* change onChange to receive a transform, update rich-text example
* fix stack iterationg, convert check-list example
* convert code-highlighting, embeds, emojis examples
* change operations to use full paths, not indexes
* switch split and join to be recursive
* fix linter
* fix onChange calls
* make all operations invertable, add src/operations/* logic
* rename "join" to "merge"
* remove .length property of nodes
* fix node.getFragmentAtRange logic
* convert remaining examples, fix existing changes
* fix .apply() calls and tests
* change setSave and setIsNative transforms
* fix insert_text operations to include marks always
* cleanup and fixes
* fix node inheritance
* fix core onCut handler
* skip constructor in node inheritance
* cleanup
* change updateDescendant to updateNode
* add and update docs
* eliminate need for .apply(), change history to mutable
* add missing file
* add deprecation support to Transform objects
* rename "transform" to "change"
* update benchmark
* add deprecation util to logger
* update transform isNative attr
* fix remaining warn use
* simplify history checkpointing logic
* fix tests
* revert history to being immutable
* fix history
* fix normalize
* fix syntax error from merge
