WIP: Feature/vote in groups

[irinahpe]

Adds a setting so that students can give their ratings in groups together.
Every member of the group will be able to see the group voting and all will be allocated to the same choice.

To do:

• show teams in ratings and allocations table
• integrate completion tracking
• write PHPUnit tests for new distribution algorithm

Closes #247, closes #37

[lucaboesch]

@irinahpe Thanks for your work.
Where are you at, could you need some support?
This feature could be very useful.

[dlmsr]

@lucaboesch I am currently looking at our other plugins to check compatibility with Moodle 4.5. When I am done, I will have a look at this pull request in more detail.

[ErrorJan]

Hello, I wanted to ask if this feature is still planned to be implemented.
In class today we have successfully invested 2h trying to assign projects to groups and were desperately searching for a solution :)

[dlmsr]

Yes, it is still planned to be implemented but not for the next release. Since we've recently moved classes from locallib.php to classes/ this needs to be rebased which is more work.