Add search and links to plugin settings (#4854)

* Show links to plugin views and settings in plugin list and in success message after activating a plugin
* Fix menu highlighting in payment provider settings
* Specify settings_links and navigation_links for built-in plugins
* Add link to payment plugins from payment settings
* Add client-side search and "View only active plugins" for plugins page

src/pretix/plugins/badges/apps.py

@@ -37,6 +37,9 @@ class BadgesApp(AppConfig):
         featured = True
         description = _("Automatically generate badges or name tags for your attendees. You can download the badges in the "
                         "backend or automatically print them with our check-in apps.")
+        settings_links = [
+            (_("Badges"), "plugins:badges:index", {}),
+        ]
 
     def ready(self):
         from . import signals  # NOQA