Record audio/video question type

This free question type is like the standard essay question type, but instead of writing some text, students have a recording widget where they can record some audio or video. We've basically taken RecordRTC (https://docs.moodle.org/501/en/RecordRTC) and implemented it as a question type. 

We consider this an evolution of an Essay question with RecordRTC buttons available to students. We have essentially taken the existing parts and distilled them into a specific question type for the ease and convenience of teachers designing quiz questions and for the students taking them.

Like the standard essay question type, it still requires human grading.

While this question type has obvious uses in Moodle Quiz, it has been primarily designed to be used in an embedded question context (see https://moodle.org/plugins/filter_embedquestion).

This question type has two behaviours: deferred feedback, for use in formal Moodle Quiz tests where a tutor would mark the students' recordings; and a new self-rating behaviour, where students mark themselves.

The self-rating behaviour is used essentially whenever the behaviour is interactive or immediate. We have assumed two use-cases:

1. the student listens to a 'model' audio clip and then records their attempt to follow it. They compare the two clips, and then rate their mimicry. Or 
2. the student attempts to pronounce a written sentence verbally, and the feedback contains a model pronunciation clip, allowing the student to then compare the clips and self-rate their accuracy.

This plugin was created by The Open University UK, specifically for its School of Languages and Applied Linguistics.