Closes #1942 #1976 #2020 #2058 #1984

Bug in ec2e44fc
Closes #2060

Closes #1448
Authored by: iw0nderhow, pukkandan

Closes #1851

[mastodon] backport 7d472bcf and 1373dde1

and some minor cleanup of docs

`-k` filters using a substring match on test name.
`-m` checks markers for an exact match.
Authored by: sulyi

Authored by: pukkandan, timethrow

https://github.com/yt-dlp/homebrew-taps
Closes: #754, #770
Authored by: nao20010128nao 

Bug from: 251ae04e

Now all core tests pass with lazy extraction enabled

Bug introduced by: 0b2e9d2c

Authored by: kidonng

`nosetests` is no longer being maintained : https://github.com/nose-devs/nose/issues/1099
and will stop working in py 3.10 as can be seen in #480