[config] fix the load_site_cubicweb() method for to 'new-style' cubes (closes #16059402) We first try to load the site_cubicweb module from the cubicweb_<cube> package, and if it fails, revert back to old cube path.

.. _appobject_module:

:mod:`cubicweb.appobject`
=========================

.. automodule:: cubicweb.appobject

   .. autoclass:: AppObject
      :show-inheritance:
      :members: