Add a lock icon to the right of tabs on which nothing is editable
for normal users. Add lock next to Custom emoji option if only admin
can edit them.
Tweaked by tabbott to use title for the lock icons, rather than
aria-hidden, since they do convey useful information.
Fixes: #10893.
The list with the options for normal settings now has
the class normal-settings-list.
The list with the options for org settings now has
the class org-settings-list.
The new markup helps us avoid code like this:
$(".settings-list li:not(.admin)")
We also have funny hacks in our key handlers related
to the old combined-list approach, which we can
eventually eliminate.
I guess we used to have a way to logout from within
settings, but the list item was always hidden when you
went into settings, so it's apparently just dead code,
and it's kind of a strange thing to have in settings.
This should make it easier to find the templates that are actually
part of the core webapp, instead of having them all mixed together
with the portico pages.