* [qt] Fix compilation of the sqlite wrapper
* [qt] Fix QImage-related warnings
* Update Qt redirection handling
Since 5.9 RedirectPolicyAttribute is preferred, and from 6.0 the
behavior of NoLessSafeRedirectPolicy is the default.
* [qt] Fix more deprecation warnings
Co-authored-by: Mårten Nordheim <morten242@gmail.com>