[downloader/ffmpeg] add -hide_banner flag unless --verbosr or --quiet option is set

[automatic] regenerate docs/supportedsites.md @ 20210228

Merge branch 'master' of https://github.com/ytdl-org/youtube-dl

[urplay] fix episode data extraction(closes #28292)

[bandaichannel] Add new extractor(closes #21404)

[automatic] regenerate youtube_dl/extractor/mastodon/instances.py @ 20210228

[codespaces] add more downloaders

[codespaces] add more Python versions

[whowatch] improve information extraction

Merge branch 'master' of https://github.com/ytdl-org/youtube-dl

[srgssr] improve extraction

- extract subtitle
- fix extraction for new videos
- update srf download domains

closes #14717
closes #14725
closes #27231
closes #28238

[tokyomotion] sort with new id_preference_dict

[extractor/common] allow giving format-sorting hint by its name
[whowatch] sort formats correctly according to their name

[whowatch] fix merged m3u8 formats

[tokyomotion] declare that it should use ffmpeg

adding Range header makes downloading faster

[whowatch] merge HLS video and audio in ffmpeg

this streams from multiple urls at once, which is what browser do

[external/ffmpeg] accept multiple inputs and additional options

[downloader/init] allow extractor to request external_downloader

[whowatch] use ffmpeg instead of rtmpdump for RTMP formats

Merge branch 'master' of https://github.com/ytdl-org/youtube-dl

[vvvvid] reduce season request payload size