[VidLii] Add 720p support (yt-dlp backport-ish) #2939

Job	Run time
Linter	22s
Select tests from inputs	1s
Run tests (ubuntu-20.04, 2.7, cpython, core, sh)	1m 1s
Run tests (ubuntu-20.04, 3.2, cpython, core, sh)	1m 9s
Run tests (ubuntu-20.04, 3.5, cpython, core, sh)	1m 10s
Run tests (ubuntu-20.04, 3.9, cpython, core, sh)	1m 9s
Run tests (ubuntu-20.04, 3.11, cpython, core, sh)	57s
Run tests (ubuntu-20.04, pypy-2.7, cpython, core, sh)	2m 33s
Run tests (ubuntu-20.04, pypy-3.6, cpython, core, sh)	2m 25s
Run tests (ubuntu-20.04, pypy-3.7, cpython, core, sh)	2m 48s
Run tests (windows-2019, 3.4, cpython, core, bat)	1m 57s
Run tests (windows-2019, 3.4, cpython, nodownload, bat)	41s
Run tests (ubuntu-20.04, 2.7, jython, core, sh)	3m 7s
Run tests (ubuntu-20.04, 2.7, jython, nodownload, sh)	21s
	19m 41s

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