tasks: normalize the url argument name of most lister
Since all the listing tasks accepts an url as first argument (whatever the argument name is), it makes sense to use a simple common argument name for this. I've chosen 'url' instead of api_baseurl/forge_url/url.
Also kill now useless new_lister()
functions.
Depends on !96 (closed)
Migrated from D1950 (view on Phabricator)