cpp: Add support for gpgme_op_revsig
* lang/cpp/src/context.cpp, lang/cpp/src/context.h (Context::revokeSignature, Context::startRevokeSignature): New. * lang/cpp/src/context.cpp (getLFSeparatedListOfStrings, getLFSeparatedListOfUserIds): New. (getLFSeparatedListOfFingerprintsFromSubkeys): Extracted second part of function to getLFSeparatedListOfStrings.
- GnuPG-bug-id: T5094