Ykdl

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- dropped supports of Python 3.4 and below 487
- a lot of improvements with utils 372 a8651a0 485 d1a6e53 5dfc760 etc.
- extractor class has been changed 641b739 c8c819c
- fixed download name 496
- update AcFun, Bilibili, CCTV/CNTV, Douyu, Huya, iQIYI, JustFun, LeTV, Mango,
Miaopai, NetEase, PPTV, Qixiu, QQ, Sohu, Weibo, Youku
- remove Dilidili, Panda

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- update Sohu, mgtv, sina, etc a lot by SeaHOH

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- update QQ, bilibili, panda a lot by SeaHOH
- misc updates

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- fix youku/tudou, QQ, mgtv, 163, bilibili by SeaHOH

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- new internal proxy for slow video playback. by SeaHOH
- update youku, many bug fixed.
- update bilibili, new api, playlist bug fixed.
- update HTTP redirection for t.cn
- use cryptodome as default.

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- update bilibili bangumi a lot, better
- update youku, support check audio_lang
- update huya, new api
- update acfun, 163 Dj and QQ
- update mpv's default parameters.