Improvements to the previous Signature commit
* Remove FormWidgetSignature::setFormSignatureType, the API was weird,
make it be an output parameter of getCheckedSignature
* include cleanup
* Make validation time mandatory, marking to use -1 for *now*
* Remove setFormSignatureType noone uses
* Fix compilation wihtout NSS3
* Don't static cast between NSS3 HASH_HashType and poppler-qt5 HashAlgorithm
* Actually pass validationTime down in FormFieldSignature::validate
* Add since markers to poppler-qt5 functions/enums
* Fix spacing
* Remove SignatureValidationInfo::signingDateTime that returns
QDateTime, having two functions that return the same is a bit confusing,
and we're not filling the timezone info anyway, so let it be a time_t
8 files changed
