Qt 6 bullseye backport

[Lisandro Damián Nicanor Pérez Meyer]

Hello! I would like to backport Qt 6 to bullseye, and I want to put
this effort into consideration to the list before proceeding.

Currently Debian bullseye lacks Qt 6. My plan is to maintain a
backport for bullseye for as long as required. This means:

- The (as of now) 29 source packages that compose Qt 6
<https://qt-kde-team.pages.debian.net/images/qt6_build_deps.png>

- A backport of libassimp, for which I contacted IOhannes to ask for
permission before (CCed).

So far I have been able to build the whole stack for Qt 6.2.2 without
any issues.

There are two things I would like to make clear from the beginning:

1) Qt 6 does provides private headers, they are needed in order to
avoid building all the source code in one go. As bullseye does not has
Qt 6 there are currently no packages making use if them, but I can't
tell if another developer will upload a package making use of them.

2) I'm making the commitment to maintain the packaging by myself as an
individual, but the work is being sponsored by The Qt Company by means
of my employer ICS.

Thoughts?

Kinds regards, Lisandro.

--
Lisandro Damián Nicanor Pérez Meyer
https://perezmeyer.com.ar/