Compatibility with Yoast SEO 5.2
Fixes a bug where the wrong timezone was used in the sitemap.
Adds post type name (attachment) after the label to clarify the post type. Fixes a fatal error when Piklist and Yoast News SEO are both active. Fixes a fatal error when Liveblog and Yoast News SEO are both active. Fixes a warning in the News sitemap when bbPress and Yoast News SEO are both active.
