Drop QT4 from master

Tue Dec 29 17:14:58 UTC 2020

Am Dienstag, dem 29.12.2020 um 12:00 -0500 schrieb Richard Kimberly
Heck:
> That may be ambitious, but we can try. I can certainly get another
> alpha out ASAP and will do so.

Thanks, much appreciated!

Jürgen

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