Download password protected external links

If a link points to a password-protected external page, this can also be downloaded with youtube-dl. The prerequisite is that a youtube-dl extractor exists for this. This is the case for owncloud, nextcloud and Zoom (and more). A configuration entry can look like this:

    "video_passwords": {
        "ruhr-uni-bochum.sciebo.de": [
            "test",
            "password"
        ],
        "secret.service.fbi": "12345"
    }

Thus, multiple passwords can be defined for one domain. This is useful if different moodle courses use different passwords. However, a single password also works.

Of course all other youtube-dl settings can still be used, it is important to note that if a password is set in config.json the videopassword parameter of youtube-dl will be overwritten for the corresponding domain.