[UI idea] Teachers should be allowed to "unsubmit" a student's program

[ora-lv]

Idea incl level As a teacher, I would like to be able to "unsubmit" a student's submitted program (so they can make revisions to it).

Additional context I use Hedy extensively for my teaching, using customized adventures for each level. My students hand in all their programs, and I review them.

When their code doesn't do what it's supposed to, I would like to be able to send their program back to them, ideally mark them as "redo", so they can update it again and resubmit.

[TiBiBa]

I love this idea! Reverting the submitted state shouldn't be too hard, I will look into this.