Convert global configuration for questions to question type entity

https://www.drupal.org/node/2383043

- [x] Update question type form
- [x] Update code to use new configuration.
- [x] Update path

### Update path

- [x] long_answer_default_max_score
- [x] multichoice_def_num_of_alts
- [x] multichoice_def_scoring
- [x] quiz_ddlines_canvas_height
- [x] quiz_ddlines_feedback_correct
- [x] quiz_ddlines_feedback_wrong
- [x] quiz_ddlines_hotspot_radius
- [x] quiz_matching_form_size
- [x] quiz_matching_shuffle_options
- [x] scale_max_num_of_alts
- [x] short_answer_default_max_score

### …

- [ ] quiz_autotitle_length