Quiz submission limit and Per Student Overrides

[JasonGrace2282]

This PR

• adds an optional limit to the amount of submissions on a assignment
• allows for a different limit after the assignment is due
• allows per student overrides for specific pieces of data on the Assignment model
• adds tests to verify behavior

It adds two new views:

• Manage Students: allows for a listing of students in the course and a button to manage their individual overrides. Accessible from Manage Students in the assignments show view.
• Manage a specific student: form view for AssignmentOverride.

TODO

• Implement the feature
• Add tests
• Add more tests (I don't trust myself)
• Improve form CSS

[krishnans2006]

Nice feature! Here are some initial "gut reaction" questions/comments for you to consider:

[krishnans2006]

The 403 for exceeding the limit seems harsh - maybe an error message would be nicer?

[JasonGrace2282]

In theory, they shouldn't be able to even get to that screen without attempting to POST that URL or manualy entering the url.

[krishnans2006]

Yeah, but I figured there's a possibility that someone has Tin open on two devices (e.g. phone, pc). So, they would submit until they reach the cap on pc, forget about it, then open the page and submit on phone.

Very obscure/rare scenario and it's probably too much effort to fix the way I described, but probably replacing it with a redirect to the assignment page would be a better solution.

[JasonGrace2282]

Finally had time to come back to this PR - that would be nice, but it makes it harder to actually test the submit view. Maybe it is worth it to just create an error page 🤔