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/control/logdisplay.py

@@ -43,7 +43,6 @@ from django.dispatch import receiver
 from django.urls import reverse
 from django.utils.formats import date_format
 from django.utils.html import escape, format_html
-from django.utils.safestring import mark_safe
 from django.utils.translation import gettext_lazy as _, pgettext_lazy
 from i18nfield.strings import LazyI18nString
 
@@ -286,7 +285,7 @@ class OrderChangedSplit(OrderChangeLogEntryType):
             _('Position #{posid} ({old_item}, {old_price}) split into new order: {order}'),
             old_item=escape(old_item),
             posid=data.get('positionid', '?'),
-            order=format_html(mark_safe('<a href="{}">{}</a>'), url, data['new_order']),
+            order=format_html('<a href="{}">{}</a>', url, data['new_order']),
             old_price=money_filter(Decimal(data['old_price']), event.currency),
         )
 
@@ -303,7 +302,7 @@ class OrderChangedSplitFrom(OrderLogEntryType):
         })
         return format_html(
             _('This order has been created by splitting the order {order}'),
-            order=format_html(mark_safe('<a href="{}">{}</a>'), url, data['original_order']),
+            order=format_html('<a href="{}">{}</a>', url, data['original_order']),
         )