Organize students in groups, especially for assignments

[utetrapp]

User Story

As a: teacher

I want: to be able to group students

so that: I can give assignments with a specific deadline for a group of students, e.g. Mo2x

Acceptance criteria:

• [ ] whitelist csv-supports includes groups
• [ ] deadlines of an assignment may be different for each group of students
• [ ] members may be grouped by these groups

Additional info:

Estimated:

• 7 x 4hr

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Please tag this issue if you are sure to which tag(s) it belongs.

[PatrickSkowronek]

related to #600

[PatrickSkowronek]

This will be developed after #600