Motivation behind? Supporting multiple major Qt versions seems almost impossible. And with the move to QML on the frontend side, it's basically not possible at all.

The idea is to only use Qt 6 only, have all references to Qt 5 completely removed, and then have a much easier time when working on the QML port again.

The only challenge here is the older Linux distributions that either don't have native Qt 6 package or aren't even supported by Qt at all (Ubuntu 18.04!).

Checklist

• OS/X
• Windows
• FreeBSD
• Fedora Linux
• Arch Linux
• Ubuntu 22.04
• Ubuntu 20.04
• RHEL
• AppImage (using Ubuntu 18.04 as base?)
• Have all support of Qt 5 completely removed.