Add pregrading

Ghost Userrequested to merge
feature/pre-grading into develop

This MR adds the pregrading feature.

Other things fixed in this MR:

  • The way feedback is inserted has been changed when a MultipleChoiceOption is inserted. Previously, the FeedbackOption that was added with the MultipleChoiceOption was blank, now FeedbackOption.Text is automatically set to MultipleChoiceOption.Label
  • A function was added that infers the 4th corner marker if only 3 are detected.

Closes #24 (closed).

Edited by RvdK

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