Add pregrading
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, theFeedbackOption
that was added with theMultipleChoiceOption
was blank, nowFeedbackOption.Text
is automatically set toMultipleChoiceOption.Label
- A function was added that infers the 4th corner marker if only 3 are detected.
Closes #24 (closed).
Edited by RvdK