[ticket/16944] Generate iconify bundle as needed via icons & assets bag

PHPBB3-16944

phpBB/config/default/container/services_assets.yml

@@ -1,8 +1,12 @@
 services:
+    assets.bag:
+        class: phpbb\template\assets_bag
+        shared: false
+        arguments:
+            - '@assets.iconify_bundler'
+
     assets.iconify_bundler:
         class: phpbb\assets\iconify_bundler
+        shared: false
         arguments:
-            - '@dbal.conn'
-            - '@ext.manager'
             - '@log'
-            - '%core.root_path%'

phpBB/config/default/container/services_twig.yml

@@ -5,6 +5,7 @@ services:
     template.twig.environment:
         class: phpbb\template\twig\environment
         arguments:
+            - '@assets.bag'
             - '@config'
             - '@filesystem'
             - '@path_helper'