updated dialog & ajax to support passing data object from PHP to dialog's submit_js_callback callback

added element_maxlength() in form.inc; added permOutput() to debug.inc; added classes to dialog wrappers; cleaned up misc debug/comments/formatting;

preventing entity_id and entity_type properties from being added to entities during feature export in Drush

dialog updates; moved entity_id and entity_type attachment out of module core and to entity component;