Yoast SEO Premium 23.9

Bugfixes:
* Re-adds wpseo_opengraph_image_size filter. This will completely override any automatic size determination our code does. This filter now also applies to all ways an og:image can be determined: In the content, as a featured image or as set in our Facebook image setting.
* Fixes an unintended backwards incompatible change which caused “Warning: Illegal string offset ‘url’ in”.
* Fixes an unintended change which caused SVGs to be included in consideration for the og:image tag. SVG images are not allowed by Facebook, so these should never be used in the og:image tag.

Enhancements:
* Adds OpenGraph image dimension-meta tags for more images.
* Excludes images from being used in OpenGraph meta tags, if the image is larger than 2MB.
* Adds caching for images found in a post to reduce load.
* Adds image alt tag to the OpenGraph output, using the meta tag og:image:alt.
* Adds the is_post_type_viewable WordPress function to improve support for the wpseo_accessible_post_types filters.

Bugfixes:
* Fixes a bug where a non-array value causes a fatal error when cron_schedules filter has been executed.
* Fixes a bug where not all database tables were removed when a subsite was deleted in a multisite environment.
* Fixes a bug where deleting multiple posts might cause performance issues. Props to Moeini.

Other:
* Introduces a message, warning about dropping of PHP 5.2 support in an upcoming version.
* Alters the configuration service text in the Configuration Wizard when a user is already running Yoast SEO Premium. Previously the text contained a reference to getting a bundled copy of Premium, even if the user was already running Premium.

Fixes a bug where the pagination overlaps the orphaned content information message, on post overview pages in combination with low resolutions.

Enhancements:
* Removes the intl polyfill and shows a message on browsers that don’t support this feature.
* Adds Baidu Webmaster Tools verification support.
* Adds import functionality for Premium SEO Pack.
* Adds import functionality for Smartcrawl SEO.
* Adds import functionality for Squirrly SEO.
* Adds import functionality for Platinum SEO Pack.
* Adds import functionality for SEO Framework.
* Adds import functionality for Greg’s High Performance SEO.
* Adds import functionality for WP Meta SEO.
* Improves the social data import for the wpSEO.de plugin.
* Removes the debug data from the admin pages, which were only showing when WordPress is in DEBUG mode.
* Applies Select2 to all select boxes on breadcrumbs page.
* Attempts to reset opcode cache during the upgrade routine.
* Changes the wording for the Ryte indexability check on the features tab.

Bugfixes:
* Prevents hard casting to array in the WPSEO_Link_Columns::add_post_columns method signature.
* Fixes a bug where an error is thrown when MySQL has the sql-mode set to ANSI_QUOTES.
* Fixes a bug where the pagination overlaps the cornerstone information message, on post overview pages in combination with low resolutions.
* Fixed a bug where the keyword filter doesn’t work on the post overview page.
* Removes HTML entities from the HTML comment that appears for admins when there’s no meta description on a post or page.
* Changes JSON+LD organization output to always point to #organization on the homepage instead of the current page.
* Fixes a bug where non-public taxonomies were shown in the breadcrumbs.

Other:
* Minor internationalization improvements.
* Security hardening.