refactor: Déplacer les classes de ecrire/public dans Spip\Core

ecrire/action/editer_article.php

ecrire/action/editer_auteur.php

ecrire/action/editer_rubrique.php

ecrire/balise/formulaire_.php

ecrire/base/abstract_sql.php

ecrire/base/connect_sql.php

ecrire/base/objets.php

ecrire/inc/acces.php

ecrire/inc/admin.php

ecrire/inc/bandeau.php

ecrire/inc/charsets.php

ecrire/inc/filtres.php

ecrire/inc/filtres_dates.php

ecrire/inc/filtres_mime.php

ecrire/inc/filtres_mini.php

ecrire/inc/install.php

ecrire/inc/lister_objets.php

ecrire/inc/modifier.php

ecrire/inc/presentation.php

ecrire/inc/presentation_mini.php