Fixes: version display / moderation handling / 'global state' hooks / etc.

Changes:

• [fix] backend ordering on versions endpoint
• [fix] frontend versions display
• [fix] frontend pending moderation and moderate
• [fix] frontend moved services Component up in the tree
• [fix] frontend fullscreen dialog: no more memory leak / setState on unmounted component
• [feat] frontend added hooks: useOnBeforeComponentMount, useOnComponentUnMount
• [fix / refacto] frontend 'global state' hooks: no more setState on unmounted components.

To test:

• Edition still works
• Displaying version (http://localhost:8000/app/university/203/general) correct order,
• Display and validation of pending moderation of works:

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• become moderator:

make shell_backend
# replace 'chehabfl' by your own UTC login
echo "from base_app.models import User; user = User.objects.get(username='chehabfl'); user.is_superuser = False; user.is_staff = False; user.save();" | ./manage.py shell

• Edit the présentation on http://localhost:8000/app/university/203/general
• Check the pending moderation view (click on the 🛡)
• Become moderator:

make shell_backend
# replace 'chehabfl' by your own UTC login
echo "from base_app.models import User; user = User.objects.get(username='chehabfl'); user.is_superuser = True; user.is_staff = True; user.save();" | ./manage.py shell

• reload the previous page, click on the shield and moderate the element.

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