feature request: make extra message windows more easily recognizable

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Hi,

when the extra message dialogs increase to dozens a turn, it would be
nice, if their main message content could be recognized intuitively.
That goal could be gained by adding a visual hint to the message.

Then, the player won't need to read every single message, but instead
could recognize the content of the message visually. That would support
the user in getting the messages handled most quickly.

e.g.:

* If a building/unit cannot be build: show the building/unit icon, but
crossed out in red.

* If a city was conquered, a three icons sequence could be drawn:
conquering unit (an arrow like this:) -> symbol of the city which was
conquered.
This visual message would become even more convincing if the nation flag
of the conquering unit and if the city symbol would be shown including
city size.

- --
cheers ... Wolfram
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