2. Fixed incorrect cleaning of the document memory by updating the pdfium library to 7269 version.
3. Fixed the constant usage of the device's processor resources after closing the document.
4. Memory consumption is significantly reduced when viewing a document by freeing up the memory of images of unnecessary pages.
5. Implemented documentation of amberpdf methods and classes in QDoc format.
6. Add signal and slot annotationAdded in PdfView component.
7. Fix pen sample incorrect behavior during text highlighting.