Merge branch 'master' into 75-migrate-to-django-3-0

.gitignore

.gitlab-ci.yml

CONTRIBUTING.rst

Dockerfile

apps/official/BiscuIT-App-Alsijil

apps/official/BiscuIT-App-Chronos

apps/official/BiscuIT-App-Exlibris

apps/official/BiscuIT-App-SchILD-NRW

apps/official/BiscuIT-App-Untis

biscuit/core/__init__.py

biscuit/core/admin.py

biscuit/core/anonymizers.py

biscuit/core/apps.py

biscuit/core/cronjobs.py

biscuit/core/decorators.py

biscuit/core/forms.py

biscuit/core/menus.py

biscuit/core/migrations/0001_initial.py

biscuit/core/migrations/0002_school_term.py

biscuit/core/migrations/0003_school_logo.py