[ticket/12090] Pass route name to url() to allow admins to change the routes

PHPBB3-12090

tests/controller/ext/vendor2/foo/config/routing.yml

@@ -0,0 +1,7 @@
+controller1:
+    pattern: /foo
+    defaults: { _controller: foo.controller:handle }
+
+include_controller2:
+    resource: "routing_2.yml"
+    prefix:   /foo