For QImage constructor, add a version where std::function is used for the clean up function

I would like to be able to specify a lambda for the clean-up function when creating a QImage.  It would allow much more flexibility for deleting the allocated buffer. something like:

QImage::QImage(const uchar data, int width, int height, int bytesPerLine, QImage::Format format, std::function<void(void*)> )