Possibility to build without QTextCodec

[xlazom00]

I would like to propose idea that we can build quazip without QTextCodec.

• with some cmake switch
• checking qt if qt has QTextCodec support

as in Qt6 QTextCodec is deprecated

And there is also option to add support for QStringDecoder
I found this
QStringDecoder vs QTextCodec

[xlazom00]

So something like this?
https://github.com/Memsource/quazip/pull/1/files

[oblivioncth]

Qt 6.4 is enabling QStringConverter to use any encoding provided by ICU when Qt is built with ICU support enabled.

https://doc-snapshots.qt.io/qt6-dev/whatsnew64.html
https://doc-snapshots.qt.io/qt6-dev/qstringconverter.html#encodingForName

In the long run this is probably the preferred alternative for handling encodings that were previously deprecated by Qt6, rather than a manual switch like the above (though they can certainly coexist). Build Qt with ICU support, get extended encoding support in QuaZip.

This would allow dropping the Qt5Compat module as a requirement when using Qt6 outright.

[cen1]

Closing in favor of a more recent #184