First pass at `wpview` logic for the `[embed]` shortcode. URLs on a their own line are parsed as well. The toolbar will appear with the "remove" button when the view is clicked. Edit has not been implemented yet.

Props avryl, wonderboymusic.
See #28195.


Built from https://develop.svn.wordpress.org/trunk@28358


git-svn-id: http://core.svn.wordpress.org/trunk@28186 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove the `title` attribute from markup generated in `wp-includes/category-template.php`:

* `get_category_parents()`
* `get_the_category_list()`
* `wp_generate_tag_cloud()`
* `Walker_Category::start_el()`	

Props joedolson.
Fixes #26557.	


Built from https://develop.svn.wordpress.org/trunk@28359


git-svn-id: http://core.svn.wordpress.org/trunk@28187 1a063a9b-81f0-0310-95a4-ce76da25c4cd