[Imgur] Overhaul extractor module #2750

Job	Run time
Linter	22s
Select tests from inputs	1s
Run tests (ubuntu-20.04, 2.7, cpython, core, sh)	1m 43s
Run tests (ubuntu-20.04, 3.2, cpython, core, sh)	3m 43s
Run tests (ubuntu-20.04, 3.5, cpython, core, sh)	1m 30s
Run tests (ubuntu-20.04, 3.9, cpython, core, sh)	1m 15s
Run tests (ubuntu-20.04, 3.11, cpython, core, sh)	1m 23s
Run tests (ubuntu-20.04, pypy-2.7, cpython, core, sh)	2m 53s
Run tests (ubuntu-20.04, pypy-3.6, cpython, core, sh)	3m 34s
Run tests (ubuntu-20.04, pypy-3.7, cpython, core, sh)	3m 25s
Run tests (windows-2019, 3.4, cpython, core, bat)	3m 5s
Run tests (windows-2019, 3.4, cpython, nodownload, bat)	1m 26s
Run tests (ubuntu-20.04, 2.7, jython, core, sh)	4m 3s
Run tests (ubuntu-20.04, 2.7, jython, nodownload, sh)	55s
	29m 18s

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