Add the ability for "viewers" to disable this feature

[MLXXXp]

In a Discourse forum I belong to, we've been discussing the possibility of adding this plugin. There are some who would like it and others who wouldn't.

To satisfy both cases, I was wondering whether it would be possible to add a user preference to not show the flags, from a viewer perspective?

The default would be "show" unless changed by a user. For those not signed in, it could do whatever it does now but a "global" flag for the behaviour with non-signed-in viewers would be nice to have.