List of exams connected to the course (new block)

[tompurker]

• Create a new block that lists exams connected to the course course.
• If an exam is active (open), highlight exam in some way.

Ideas:

• Clearly show which exams are past, active, or upcoming
• Have a way for student to check results for a past exam that they have taken. A button? 'View results' or similar.