shinyQuiz: Create a shiny quiz widget
In skranz/RTutor2: Complete rewrite of RTutor internals combined with armd

Create a shiny quiz widget

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shinyQuiz(id = paste0("quiz_", sample.int(1e+11, 1)), qu = NULL, yaml,
  quiz.handler = NULL, add.handler = TRUE, single.check.btn = TRUE,
  defaults = quizDefaults(lang = lang), lang = "en")

`id`	the id of the quiz
`qu`	a list that contains the quiz fields as would have been parsed by read.yaml from package YamlObjects
`yaml`	alternatively to qu, is yaml a string that specifies the quiz
`quiz.handler`	a function that will be called if the quiz is checked. The boolean argument solved is TRUE if the quiz was solved and otherwise FALSE