[YouPorn] Fix and improve extraction; add playlist extraction #2904

Job	Run time
Select tests from inputs	7s
Linter	23s
Run tests (ubuntu-20.04, 2.7, cpython, core, sh)	1m 5s
Run tests (ubuntu-20.04, 3.2, cpython, core, sh)	1m 1s
Run tests (ubuntu-20.04, 3.5, cpython, core, sh)	1m 25s
Run tests (ubuntu-20.04, 3.9, cpython, core, sh)	1m 5s
Run tests (ubuntu-20.04, 3.11, cpython, core, sh)	1m 10s
Run tests (ubuntu-20.04, pypy-2.7, cpython, core, sh)	2m 27s
Run tests (ubuntu-20.04, pypy-3.6, cpython, core, sh)	2m 42s
Run tests (ubuntu-20.04, pypy-3.7, cpython, core, sh)	2m 35s
Run tests (windows-2019, 3.4, cpython, core, bat)	2m 4s
Run tests (windows-2019, 3.4, cpython, nodownload, bat)	51s
Run tests (ubuntu-20.04, 2.7, jython, core, sh)	3m 1s
Run tests (ubuntu-20.04, 2.7, jython, nodownload, sh)	28s
	20m 24s

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