New functions added on 21/09/2019:
- _rest_array_intersect_key_recursive
- _wp_clear_upload_ref
- _wp_get_upload_ref_attachment_id
- _wp_image_meta_replace_original
- _wp_set_upload_ref
- core_social_link_get_icon
- register_block_core_block
- register_block_core_latest_comments
- register_block_core_social_link
- render_core_social_link
- rest_is_field_included