[Users] Fancy plugin remote and external issues in GTK3 branch

[Orivej Desh]

* Paul <claws at thewildbeast.co.uk> [2020-12-11]
> On Fri, 11 Dec 2020 00:11:02 +0000
> Orivej Desh <claws-mail+qupwc at orivej.org> wrote: 
> 
> > First, it does not respect that "Enable remote content" is disabled (both
> > in the plugin settings and in the toolbar settings under the message) and
> > still loads remote content such as images. Second, even with "Open links
> > with external browser" enabled it opens links in the message view.
> >
> > Can you reproduce these? Were they known before?   
> 
> Yes, the first issue was stated in the beta release announcement:
> https://lists.claws-mail.org/pipermail/users/2020-October/027277.html
> The second is also known.

Thanks! Here are my proposed fixes:
https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4424
https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4425