Merge pull request #2934 from HyphaApp/maintenance/theskumar/update-wagtail-3

hypha/apply/activity/adapters/__init__.py

hypha/apply/activity/adapters/activity_feed.py

hypha/apply/activity/adapters/base.py

hypha/apply/activity/adapters/django_messages.py

hypha/apply/activity/adapters/emails.py

hypha/apply/activity/adapters/slack.py

hypha/apply/activity/adapters/utils.py

hypha/apply/activity/messaging.py

...ty/templates/activity/include/notifications_dropdown.html

hypha/apply/activity/tests/test_messaging.py

hypha/apply/api/v1/determination/views.py

hypha/apply/api/v1/filters.py

hypha/apply/api/v1/review/views.py

hypha/apply/api/v1/screening/tests/test_views.py

hypha/apply/api/v1/screening/views.py

hypha/apply/api/v1/utils.py

hypha/apply/categories/blocks.py

...s/migrations/0003_rename_meta_categories_to_meta_terms.py

hypha/apply/categories/models.py

hypha/apply/dashboard/tests/test_views.py