Panoptescli

- Update pyyaml requirement to >=3.12,<4.2

- Fix: Modifying projects makes them private

- New: Add --version option
- New: Add info command
- New: Add help text for all commands
- New: Add progress bars for data export downloads
- Fix: Modifying project public/private status
- Remove non-functional `--project-id` option from `subject-set modify`
- Rename `workflow download` to `workflow download-classifications`
- Rely on API to validate file types

- New: Set default endpoint to www.zooniverse.org
- New: Standardise options and arguments
- Fix: Fix remote media in Python 3
- Remove default download timeouts

- New: Add 'quiet' option to ls commands
- New: Allow listing multiple subjects by ID
- New: Add short option for subject set id in subject ls
- Fix: Use next(reader) rather than reader.next()

- New: Add support for remote subject media locations