qt: Extend signkeyjob to handle remarks and dups
* lang/qt/src/qgpgmesignkeyjob.cpp: Handle remarks and dupeOK. * lang/qt/src/signkeyjob.h (SignKeyJob::setDupeOk), (SignKeyJob::setRemark): New.
This API makes it easy for Kleopatra to add remarks for:
- GnuPG-Bug-Id: T4734