3.9.0 Feature & Maintenance Release

What's Changed

• Feature: @matchaxnb - Added support for additional configuration constants.
• Feature: @schanzen - Added support for agregated claims.
• Fix: @rkcreation - Fixed access token not updating user metadata after login.
• Fix: @danc1248 - Fixed user creation issue on Multisite Networks.
• Feature: @RobjS - Added plugin singleton to support for more developer customization.
• Feature: @jkouris - Added action hook to allow custom handling of session expiration.
• Fix: @tommcc - Fixed admin CSS loading only on the plugin settings screen.
• Feature: @rkcreation - Added method to refresh the user claim.
• Feature: @Glowsome - Added acr_values support & verification checks that it when defined in options is honored.
• Fix: @timnolte - Fixed regression which caused improper fallback on missing claims.
• Fix: @slykar - Fixed missing query string handling in redirect URL.
• Fix: @timnolte - Fixed issue with some user linking and user creation handling.
• Improvement: @timnolte - Fixed plugin settings typos and screen formatting.
• Security: @timnolte - Updated build tooling security vulnerabilities.
• Improvement: @timnolte - Changed build tooling scripts.

Full Changelog: 3.8.5...3.9.0