feat: add "web handler" feature; it must get the menu handler

this makes more sense than (potentially) adding a whole bunch of
methods to the app handler.

also fix entry point for app provider, per wj changes

tests/test_menus.py

@@ -159,6 +159,12 @@ class TestMenuHandler(TestCase):
         self.assertTrue(entry['is_sep'])
         self.assertFalse(entry['is_menu'])
 
+    def test_make_raw_menus(self):
+        # minimal test to ensure it calls the other method
+        with patch.object(self.handler, 'make_menus') as make_menus:
+            self.handler._make_raw_menus(self.request, foo='bar')
+            make_menus.assert_called_once_with(self.request, foo='bar')
+
     def test_do_make_menus_prune_unallowed_item(self):
         test_menus = [
             {