Warc2zim

* Added `--custom-css` option

* Added `--progress-file` option

* Update to wabac.js 2.1.6

* Favicon loading fixes: In topFrame.html, load favicon URL directly from ZIM A/ record, bypassing service worker H/ lookup.

* Supports 'fuzzy matching' with additional redirects add from normalized URL to exact URL
* Add fuzzy matching rules for youtube and '?timestamp' URLs
* Fix canonicaliziation where URLs that contain http/https were being incorrectly stripped (https://github.com/openzim/zimit/issues/37)

* Accepts directory inputs as well as individual files. If directory given, which will process all .warc and .warc.gz files recursively in the directory.
* If trailing slash is missing on main URL, `--url https://example.com?test=value`, slash added and URL treated as `--url https://example.com/?test=value`