qt5: Allow to load document from QIODevice
Extract BaseSeekInputStream class from PopplerInputStream class and inherit an introduced Poppler::QIODeviceInStream from it. This allows to implement Poppler::Document::load(QIODevice *, ...) overload.
Extract BaseSeekInputStream class from PopplerInputStream class and inherit an introduced Poppler::QIODeviceInStream from it. This allows to implement Poppler::Document::load(QIODevice *, ...) overload.