Encode/decode learnr's new tutorial_state reactive
#14
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This is an ugly PR that should help you play with the new
tutorial_statereactive exposed by learnr in rstudio/learnr#562. I commented out the outputs related to individual exercise/question extraction since it's relatively straight-forward to report the tutorial state in a single tibble. I mostly tested this update with thedemo_types.Rmdtutorial, where it seems to work nicely.