Avoid PHP notices in _count_posts_cache_key(), _update_blog_date_on_post_publish(), and _update_blog_date_on_post_delete() if post type is not registered.

props jesin.
fixes #28135.
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Use 3-digit x.x.x style for two 4.0.0 @since versions.

see #28885.
Built from https://develop.svn.wordpress.org/trunk@29319


git-svn-id: http://core.svn.wordpress.org/trunk@29100 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid PHP notices in Media Library if an attachment parent post type no longer exists.

Synchronize the 'edit_post' capability check between the list table and the media grid.

fixes #27446.
Built from https://develop.svn.wordpress.org/trunk@29320


git-svn-id: http://core.svn.wordpress.org/trunk@29101 1a063a9b-81f0-0310-95a4-ce76da25c4cd
wpLink: add keyboard navigation, improve accessibility. Props afercia, fixes #28897.
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