This PR restores the task list presentation removed in 4.8:
- Add “task-list-item” class to task list `<li>` elms
- Hide list bullets on unordered task lists `<li>` elms
It also provides several improvements on the pre-4.8 presentation:
- Add “task-list” class to task list `<ul>` elms
- Display list numbers on ordered task lists `<li>` elms
- Render accessible task list items by wrapping checkbox and text in `<label>` elm
- Allow task lists to be nested within standard ordered/unordered lists
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* [x] Make sure you are merging your commits to `master` branch.
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* [x] DO NOT include files inside `lib` directory.
