addurl, importfeed: Added --raw-except option

--raw-except=web allows using yt-dlp but not any other special remotes.

Currently this option can only be used once, trying to use it repeatedly
will make option parsing fail. Perhaps it ought to support being used more
than once, but it seemed like an unlikely use case to need that.

Note that getParsed is called repeatedly when the option is used with
several urls. While implementing DeferredParseClass would avoid that
innefficiency, it didn't seem worth the added boilerplate since
getParsed only calls byNameWithUUID which does minimal work.

Sponsored-by: Dartmouth College's DANDI project

doc/todo/addurl_--raw-except_REMOTEs__63__.mdwn

@@ -3,3 +3,5 @@ I think generally we would still prefer to use `--raw` as to avoid possible side
 
 [[!meta author=yoh]]
 [[!tag projects/dandi]]
+
+> [[done]] --[[Joey]]