by aaron: Add prefix/suffix div wrapper to class output.
by aaron: Add 'name' & 'settings' to $effects; create styles_instance().
WARNING: If you're using a previous version, this will break compatibility with modules using that version, so ensure that module supports DRUPAL-6--2-0-ALPHA4 or later.
Developer notes: Ensure that any passed effects now include the effect 'name' and an array of 'settings'.