quizz 7.x-6.0-alpha4

(1) This release is not also stable for production use yet. Please help testing and report bugs, so we have beta release faster.

> Please note that this release breaks everything. There are a lot of changes, without backward compatible:

(2) Upgrade code from original module is removed. To migrate data from quiz, we must use quizz_migrate.module.

(3) Most of sub modules are moved to separated projects:

- https://www.drupal.org/project/quizz_cloze
- https://www.drupal.org/project/quizz_ddlines
- https://www.drupal.org/project/quizz_matching
- https://www.drupal.org/project/quizz_multichoice
- https://www.drupal.org/project/quizz_pool
- https://www.drupal.org/project/quizz_scale
- https://www.drupal.org/project/quizz_text (long/short answer)