Nndownload

- Fixed reading requirements during setup for package

- Add -a (add metadata to MP4 video container)
- Add --html5 (always download file served by the HTML5 player)
- Fix race condition in multithread downloading
- Fix manga tag extraction
- Various other bug fixes

- Download channel videos and blogs
- Support for new user video (/video) and mylists (/mylist) pages
- Support for Seiga user image (/user/illust) pages
- Reorganize metadata parameters
- Added `document_url` and `tags` for all types of media
- Check for region lock on videos
- Better status checking for namas

- Use AIOHTTP for WebSocket connections
- Now WebSockets honor the user supplied proxy
- Fix URL change with Nico Seiga manga
- Fix generating live stream URLs
- Minimum Python version now >=3.5.3 (from >=3.6)

- Download with multiple URL or file arguments
- Fix existing file deletion on byte comparison block mismatch
- Replace another illegal path character in filenames for Windows

- Add -s (download only metadata)
- Fix uploader metdata extraction for Seiga manga
- Various other small fixes