Allow duplication of questions within exercises

[rtibbles]

Desired behavior

As noted by content creators at Project Village, sometimes questions can be made with the same multiple choice answers, with the only difference being the prompt text, and which answer is correct. To allow this to be done quickly, being able to duplicate a question within an exercises would be desirable.

Current behavior

Currently to achieve this, a user must create a new question, and then copy paste all the relevant information from one question to the other.