Add clearing portal messages when portal closes, same as war messages

[no1here2]

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[XtremeOwnageDotCom]

So- this ticket isn't setting completely un-answered.....

Since I have not been using discord much, and nobody has been giving any feedback whatsoever of the status of the bot, this ticket will sit around idle until I accumulate enough requests/ideas/problems, and the will to start updating the source code- OR, until somebody else determines they would like to sit down and publish a pull request with the feature implemented.

But- it is a good idea- for the record.

[XtremeOwnageDotCom]

This was never completed, because the duration a portal is open, is not a consistent time.

With war events, these are easy to trigger events for, as we know the exact timing more or less. For portal events, we only know the end time.

[XtremeOwnageDotCom]

A tad old, but, closing this ticket with dev release 4.1.4

https://docs.warbot.dev/Changelogs/v4.0/v4.1.4/

Does add the ability to clear the channel after a current maximum, of one day.