Flag button on user profile

[trichoplax]

Is your feature request related to a problem? Please describe.
If a user has no posts and only exists to host a spam link in the user profile, there is currently no way to flag this for moderator attention (the workaround of flagging one of their posts doesn't work if they have no posts).

Describe the solution you'd like
A button on the user profile to allow anyone to flag it for moderator attention.

[cellio]

I think the only flag "type" that makes sense here is "mod attention", as only mods can do anything about profiles, so let's make it a flag button/link that asks for details in a textbox. Don't need flag menus here. (Let's distinguish it from the "mod attention" flag on posts. I believe that one's baked in, not defined in the flags YAML file, and this profile flag should be baked in too.)

The flags list will also need to display profile flags. I don't think posts are baked in there because comments are flaggable, but there might be some underlying code assumptions that'll need to be broadened.

[trichoplax]

I could imagine different types being useful if sufficient flags had an automatic effect (such as 10 spam flags hiding the profile from non-mods until a mod has made a decision), but if there are no plans for that then just the one text box sounds good. I don't think that would exclude any future enhancements.

[cellio]

Oh, that's a good point. I think when we get to that point, converting the single flag into a menu won't be big deal, but it sounds like it'd be a good idea for the underlying code to assume more than one option, so that we're only changing the UI when we get there.