Encapsulate parsing student grading info from CSV

Christian Rohlfingrequested to merge
rohlfing-student-grading-info into master
  • I encapsulated CSV file parsing into utils/moodle.py
  • I used this functionality in
    • preparemoodle.py
    • submissions.py
    • preparepdf.py
  • I iterated heavily over preparepdf.py

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