Dev to master

Add question API

See merge request !58

Signed-off-by: Ruben Backx <r.w.backx@student.tudelft.nl>

Add active session plus grace period endpoint

See merge request !57

Add permission api controller

See merge request !54

Signed-off-by: Ruben Backx <r.w.backx@student.tudelft.nl>

Resolve "Update labradoor to get cluster summaries from core"

Closes #12

See merge request !53

Update specification and update license headers

See merge request !52

Bumps down the OpenAPI Generator version

See merge request !51

This down-bump is again necessary because of problems caused in client
applications. This bump caused problems with LCPageable objects that
became buggy to use. For now, we bump the version back down to exactly
what it was, we can later try to bump it back up, but will need to be
cautious when doing so.

Update default role after logging in

See merge request !50

The person object in the authenticated principal did not get updated
with the correct default role from Labracore. This commit adds an update
to the onAuthenticationSuccess method in
LabradorAuthenticationSuccessHandler to fix this.