* Add GPG implementation of css::xml::crypto UNO interfaces (part of that is only stub atm)
* List gpg keys along with other certificates
* Viewing gpg certificates: Not all properties are implemented yet

Change-Id: I7f60b26efe949a94bf8fe1b8d4d428002c2995b1
Reviewed-on: https://gerrit.libreoffice.org/33843Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Siegmund Gorr <siegmund.gorr@cib.de>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>