Issue #3099680 by VadymK, voleger, Dave Reid, alex_optim, pifagor: Replace deprecated file_default_scheme()

Issue #2941164 by Dave Reid: Fixed multilingual alternate rel links might not always be present if translated content is also referenced by other links.

Issue #2941164 by Dave Reid, WidgetsBurritos: Added support for using rel="alternate" rather than multiple sitemaps by language context.

Issue #3017153 by Dave Reid, dpi: Fixed XML sitemap form fields should only be added to edit forms only.

Issue #3012402 by thalles, Dave Reid: Fixed XmlSitemapLinkBundleSettingsForm to use dependency injection.

Issue #3042673 by Dave Reid, Sergiu Stici, ChristianAdamski, KarimB, Nikhilesh Gupta, Tolyan4ik, Saphyel, amateescu, RajeevChoudhary, voleger, kkalaskar, thalles: Removed Drupal 9 deprecated code and fixed coding standards.

Issue #3072108 by leymannx, Dave Reid: FatalThrowableError accessing entity settings form due to typehinting on State rather than StateInterface.

Issue #2985257 by blacklabel_tom, rivimey, alex_optim, pifagor: Remove deprecated db_and and db_or from hook_query_xmlsitemap_generate_alter example

Issue #2675490 by pifagor, jribeiro, alex_optim, Chris Matthews, Dave Reid: [drush] xmlsitemap-rebuild should output WARNING instead of ERROR when there are no links rebuildable

Issue #3044390 by bvoynick, alex_optim, voleger: Curl timeouts are unhandled in xmlsitemap_custom form validation

Issue #3015350 by thalles, alex_optim, voleger, pifagor: Drupal dependency injection on XmlSitemapEntitiesSettingsForm

Issue #2999856 by Arrow, MerryHamster, Rob Holmes, pifagor, KarenS, Liam Morland, alex_optim: Allow Override of Base URL in settings.php

Issue #3035662 by thalles, Romixua, oyushchenko, pifagor: Replace usages of the deprecated drupal_set_message() function

Issue #2873306 by sathish.redcrackle, voleger, alex_optim, RenatoG: Replaced deprecated url() and l()

Issue #2971266 by nabiyllin, thalles, Akshay kashyap, voleger, pifagor, amit.drupal, Dave Reid: Remove t() to $this->t() used in Drupal best practices

This reverts commit ec1a9728.

Issue #2831778 by Andreas Hansson, DamienMcKenna, Chris2, RenatoG, Dave Reid: Sitemap file size increase for Google and Bing

Issue #2788377 by Sam152, RenatoG: High form element weight moves sitemap options below "Save" button on term edit pages

Issue #2924422 by rbayliss, dpi, jibran, RenatoG: xmlsitemap_get_link_info() causes entity_type cache tag clear on every node edit page view