Migrating to SignDoc SDK 5.0.1.28

SPTiff_44.dll (libSPTiff_44.so, libSPTiff_44.dylib) has been replaced by SPTiff_45.dll (libSPTiff_45.so, libSPTiff_45.dylib).

de.softpro.doc.SignDocDocument.createStampAnnotation and de.softpro.doc.SignDocAnnotation.setDescription have been added.