Improve the generation of `<title>` tags as follows:
* use `page` in preference to `self` (self has been semi-deprecated ever since we added jinja2 support)
* Retrieve current site with `{% wagtail_site %}` rather than page.get_site so that it works on non-pages such as 404s
* Fill in the 'title' block on 404.html
Previously, this would fail, as `user_can_copy_obj` doesn't handle root
pages. Root pages also are special in a number of ways, and handling
copying is tricky and non-obvious.
If someone needs to show root pages (for some reason), they'll have to
special case them themselves.
Introduce a WAGTAIL_WORKFLOW_ENABLED setting; when false, the workflow report and settings menus are hidden, permissions are not registered, moderation-related dashboard panels on the homepage are skipped, workflow actions on add/edit page are hidden, and model methods such as page.current_workflow_state return None / False immediately without any db queries.
* Reorganise snippet admin URLs to avoid ambiguous paths
Snippet admin views allow for arbitrary strings as primary keys, and the current URL patterns don't adequately namespace these from reserved words like 'add' - for example, a snippet with the primary key 'add' would have an edit URL that collides with the add view at `/admin/snippets/foo/bar/add/`.
This is unlikely to come up in practice, but it does mean that our urlconf is more sensitive to ordering than it needs to be. Rearrange so that the verb (add, edit, delete) consistently comes before the pk, and add redirects to handle the legacy URLs.
* Release notes for #7208
Co-authored-by: Storm Heg <storm@stormheg.co>
* Version bump to start work on 2.14
* Removed StreamValue.stream_data and StreamValue.TupleView
* Rotate deprecation warning classes
* Set up changelog and release notes for 2.14
* Changelog / release note for #7023
* Add 2.14 to the compatibility table in the upgrading guide
