Trading ships/caravans should not take damage from plagues

[wooden bolt]

When you get the plague crisis settlements infected by the plague take damage but this damage applies to every unit including traders which aren't controllable. Trade routes getting knocked out because they travel through a settlement that has plague might be thematic but because you have no control over them it feels really bad to lose the units.

I know trade routes are not guaranteed as they can be plundered but you can always escort traders if you're concerned about raiders. You can't do anything about the plague though.

Also please give us a trade menu so we know what trade routes are available. This could help if we're keeping the plague killing traders as at least then we will know which trade route is no longer happening.

[tame ice]

I don't really have a view on whether trade caravans should be killable or not, but I'd add to the last point that as well as a trade overview, the notification you get should say which trade route was killed. "You lost a trade caravan to the plague" isn't terribly helpful. "A trade caravan on its way to Roma was lost to the plague" is much better.