Plans for Qt6? / Maintenance only project

[a17r]

Qt5 upstream OSS support ended on 2020-12-08, and LTS releases - even with considerable effort by KDE community's backports on top - only go so far. Personally, I've stopped making backports. With major Qt-based desktop environments having ported fully away from Qt5, you can expect any future build time issue for Qt5 to be the final trigger for Qt5-removal among distributions' repositories. For Gentoo, this is already in progress.

So, having a perspective to Qt6 porting will help keep this project available in distributions.