Begin refactor and testing of conference service.
Test attachment parsing.
Add upload tests.
Handle missing API key in tests.
Add integration test.
Fix test base class.
Mock upload service calls.
Use valid email recipients in tests.
Remove unnecessary cast to dictionary.
Merge branch 'hotfix/0.22.3'
Merge branch 'hotfix/0.22.4'
Fix top navbar and side navbar on registration settings page

fix #1424
Merge branch 'hotfix/0.22.5' into develop
Merge branch 'feature/conference-refactor' into develop