Add a 'Go until 100% answered' option to assessments.

[FrenjaminBanklin]

See #2035 and #547.

As a possible alternative to the completion threshold option in #2035, add a new assessment mode where students are presented with every possible question in an assessment regardless of question bank settings, and must answer every question correctly in order to pass.

All questions are presented to the student on the first attempt, and subsequent attempts will only contain questions not already answered correctly. Reaching the attempt limit would send a score to the gradebook corresponding to the number of questions answered correctly from the total pool.

Students should also have a 'I'm okay with this, just send the score already' option to send a score back and zero out their remaining attempts.

Partial credit can be calculated using two parameters: Number of problems given on the first attempt, N, and number of problems to be given on the next attempt, n. The score is simply (N-n)/N, if n is the number of incorrect answers on the previous attempt.

[FrenjaminBanklin]

Possible solution to this would be to somehow add questions and their answers (or maybe just the answers) to the session somehow. Potentially when the assessment attempt is started/resumed and the document is parsed, add all of the relevant answer information to the session so that it can be checked when any given question is answered by the students.

No idea what this will look like or if it will work.