Converting oolong questions into a data frame

[chainsawriot]

Ref this tweet

The original question asks for exporting to csv. I think a much better way is to export it to a "tidy" data frame / tibble so that the user can export it to whatever format using write.csv or rio or whatnot.

The problems

1. How to prevent cheating (exporting the data frame to read the answers)
2. The data frame stored in an oolong test is not "tidy" (it has list columns); but it can be easily fixed.