[RFC] Add a feed-option to ignore ssl-issues

Hi all,
having an (opt-in) feed option to ignore ssl issues with a feed-source would be nice because i.e. sometimes it happens that certs expire without providing a valid in-time.

This causes ttrss to not update the affected feed(s) and blow up my unread posts as soon as the problem is fixed and the feed are updated again.

So having this option and temporary enable it in this cases would prevent such a blow up.

you can make a plugin for that. an option though, no.