2.1.0

First release after a maintenance break. No breaking changes, all hook and filter names are unchanged.

• Fix invalid REQUEST_URI check in capture_sso_logout, which made SSO initiated logout return early on every request and never log the shadow user out, #2 (thanks @teppokoivula!)
• Move code style checks to Dude Coding Standards, replacing the copied theme ruleset that referenced sniffs which no longer exist in WPCS 3
• Add PHP lint and PHP 8.3 compatibility workflows
• Rewrite README, document all functions, filters and actions with their signatures and add the legacy hook name mapping
• Document that credentials are read with getenv() and that define() in wp-config.php does not work, which is the most common reason the login url comes out empty
• Add Requires at least, Requires PHP and License URI to the plugin header. Minimum PHP is now 8.0, which is the oldest version the plugin is actually verified against
• Add changelog and gitignore
• Remove editor generated file headers