Added
- New client methods:
- `activate_survey`
- `activate_tokens`
- `add_participants`
- `add_response`
- `delete_participants`
- `delete_survey`
- `download_files`
- `export_responses`
- `export_responses_by_token`
- `get_participant_properties`
- `get_response_ids`
- `get_site_settings`
- `get_survey_properties`
- `import_survey`
- `list_participants`
- `list_questions`
- `list_surveys`