Cmake build wit qt(5|6)(macos) did not include "plugins"

Cmake build wit qt(5|6)(macos) did not include "plugins"

This makes things much simpler.

But at least with the latest macos tools (Sonoma and XCode15) a bundle
refuses to run if it 's not signed properly.

Both issues are solved with the patch included and have now been tested
with Qt5.15 and Qt6.7.

For completeness: I've checked the font-emph shortcut issue and, as
reported in the ticket mentioned, ^CmdE works with Qt5.15 but not with
Qt6.7. However the sequence ^C E does work. I don't know whether this is
intended as a workaround for this issue or was already implemented.