Make permalink import from phpBB3 configurable

There are a few changes to the original permalink import:
- adds permalinks for posts
- does not create incorrect permalinks for private messages
- adds permalink normalizations for topics and posts

script/import_scripts/phpbb3/importer.rb

@@ -33,6 +33,12 @@ module ImportScripts::PhpBB3
       import_bookmarks if @settings.import_bookmarks
     end
 
+    def change_site_settings
+      super
+
+      @importers.permalink_importer.change_site_settings
+    end
+
     def get_site_settings_for_import
       settings = super
 
@@ -108,29 +114,6 @@ module ImportScripts::PhpBB3
       end
     end
 
-    # uncomment below lines to create permalink for categories
-    # def create_category(opts, import_id)
-    #   new_category = super
-    #   url = "viewforum.php?f=#{import_id}"
-    #   if !Permalink.find_by(url: url)
-    #     Permalink.create(url: url, category_id: new_category.id)
-    #   end
-    #   new_category
-    # end
-
-    # uncomment below lines to create permalink for topics
-    # def create_post(opts, import_id)
-    #   post = super
-    #   if post && (topic = post.topic) && (category = topic.category)
-    #     url = "viewtopic.php?f=#{category.custom_fields["import_id"]}&t=#{opts[:import_topic_id]}"
-
-    #     if !Permalink.find_by(url: url)
-    #       Permalink.create(url: url, topic_id: topic.id)
-    #     end
-    #   end
-    #   post
-    # end
-
     def import_private_messages
       if @settings.fix_private_messages
         puts '', 'fixing private messages'
@@ -172,8 +155,7 @@ module ImportScripts::PhpBB3
       # no need for this since the importer sets last_seen_at for each user during the import
     end
 
-    # Do not use the bbcode_to_md in base.rb. If enabled, it will be
-    # used in text_processor.rb instead.
+    # Do not use the bbcode_to_md in base.rb. It will be used in text_processor.rb instead.
     def use_bbcode_to_md?
       false
     end