- [X] Add optional depends. We can always remove them if needed.
- [X] This requires making a patch like [this section](https://cgit.kde.org/trojita.git/tree/CMakeLists.txt?id=feb264cda151a7dfbf39a2d7c774f4b7cc0b6dff#n92) of the upstream code to account for the fact that upstream GPGME rolled in various bindings, including the Qt ones. The initial release will then be 0.7-0ubuntu1.