Add RoboMind like Puzzles

[Felienne]

Robomind and other tools like Code.org support puzzles where a thing like a robot (or an Elsa from Frozen) has to perform a task, maybe we could also add these types of task?

It would entail:

• Thinking of fun tasks (reaching a location, drawing a square etc)
• Thinking of a kid friendly way to verify the correctness of the solution
• Add a tab to the user interface
• Think of the layout and UX of the tab

This could be done with our existing turtle code, but maybe that is too free (it might be too hard to check if, for example, a square is drawn in the freeform we have than in the grid based robomind approach?