Ported several modules to the ObjectManager (S7).
Corrected CommonObject handling. Add ArticleDir in Defaults.pm to avoid hard errors on missing ZZZAAuto.pm.
Corrected filter behaviour.
Corrected error message for post filters.
Don't allow pre filters to operate on all templates as this would cause severe performance issues.
Simplified output filter handling.
Ignore any pre/post filters that operate on all templates.
Merge remote-tracking branch 'upstream/master' into otrs-master