Zimscraperlib

- added s3transfer to verbose dependencies list
- changed default log format to include module name

- verbose dependencies (urllib3, boto3) now logged at WARNING level by default
- ability to set verbose dependencies log level and add modules to the list
- zimscraperlib's logging level now aligned with scraper's requested one

- fix_ogvjs_dist script more generic (1)
- updated zim to support other zimwriterfs params (10)
- more flexible requirements for requests dependency

- fixed return value of `get_language_details` on non-existent language
- fixed crash on `resize_image` with method `height`
- fixed root logger level (now DEBUG)
- removed useless `console=True` `getLogger` param
- completed tests (100% coverage)
- added `./test` script for quick local testing
- improved tox.ini
- added `create_favicon` to generate a squared favicon
- added `handle_user_provided_file` to handle user file/URL from param

- fixed fix_ogvjs_dist

- initial version providing
- download: save_file, save_large_file
- fix_ogvjs_dist
- i18n: setlocale, get_language_details
- imaging: get_colors, resize_image, is_hex_color
- zim: ZimInfo, make_zim_file