IDA 9.2 / Qt 6 support

[cross-of-north]

Starting from version 9.2 IDA uses Qt 6.

IDA developers provide the compatibility layer for Python scripts using Qt 5, but no compatibility layer included for C++ plugins compiled for Qt 5, so the latest official Labeless release refuses to load with IDA 9.2 and 9.3 (at least on Windows - it fails to locate Qt 5 DLLs).

This PR implements code changes required to build Labeless IDA plugin along with Qt 6 and the latest IDA SDK.
The resulting plugin DLL works with IDA 9.2, 9.3.

Known limitations:

• Only Windows plugin is currently implemented/tested.
• The only major feature that was tested is export of labels from IDA to x64dbg (including GUI "Labeless configuration" dialog).
• Changes introduced should not affect older IDA plugins build process or behavior, but I haven't tested whether it is truly so.

[a1ext]

Hi @cross-of-north, thanks for submitting the PR, I will check it soon :)

[a1ext]

Sorry for the delay, actually shit happens I have no ability to build plugin on windows. I definitely will take a look at the PR when I have good env.
Thanks :)