MDL-71696 core_question: Implement question status change

This commit implements the status change pop up for a question
in the base view. This feature update will allow the change of
status of a question without creating a new version.
This commit also implements the status as a char rather than
an int value.

question/format/xml/format.php

@@ -1182,6 +1182,7 @@ class qformat_xml extends qformat_default {
         $invalidquestion = false;
         $fs = get_file_storage();
         $contextid = $question->contextid;
+        $question->status = 0;
         // Get files used by the questiontext.
         $question->questiontextfiles = $fs->get_area_files(
                 $contextid, 'question', 'questiontext', $question->id);