* scraper: Initial work for other charset support
Not working
* scraper: Get charset from html instead of http headers
Not working
* scraper: Charset working
* scraper: Fix regex ('"' after equals)
* scraper: Use lazy_static for charset regex
* misc: Refactor pr
* tests: Refactor fixtures
* tests: Add html charset support tests
* tests: Charset, split tests
* downloader: Get charset from http headers
* misc: Clarify iterator first
* Apply suggestions from CohenArthur
Co-authored-by: CohenArthur <arthur.cohen@epita.fr>