quiz_setup: Set up the quiz environment
In martina-starc/peRson: Get To Know Your Colleagues Quiz

Everything the quiz needs to work is assigned to variables in the quiz environment. Quiz functions access these variables through the quiz environment that can be passed as an argument or set as a global option 'peRson.quiz'.

quiz_setup(
  questions,
  participants,
  presence = NULL,
  shuffle = TRUE,
  create_sheets = TRUE
)

`questions`	A data frame with questions (see [demo_questions] for format).
`participants`	A data frame with participants (see [demo_participants] for format).
`presence`	Vector of present participants' names. If NULL, all participants from participants data frame (participants$name) will be deemed present.
`shuffle`	If TRUE, the order of answers and questions is randomly shuffled by [shuffle_answers()] and [shuffle_questions()] respectively.
`create_sheets`	If TRUE, a Google Sheet for answers is created for and shared with each participant, plus one summary sheet containing imported answer sheets (though the sheets need to be linked manually in the sheet before answers can be read from it).

A quiz environment with the following variables.

presence: vector or present participants' names
css_file: path to css file used to style the HTML quiz files
all_questions: data frame with all the provided questions from the questions data frame (shuffled if shuffle is TRUE)
questions: data frame with questions that will be used in the quiz (only those whose askers are present)
participants: data frame with participants from the participants data frame (with added variables chose_color, dist, present and answer_sheet if create_sheets is TRUE)
summary_sheet_id: if create_sheets is TRUE character id of the created summary sheet
named_colors: vector of hex colors chosen by participants, named with their names, plus average color of chosen colors with "avg" name
question_colors: vector of hex colors for each question in questions based on the person who asked it
answers: empty list that will be filled with answers by [evaluate_answers()]