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To not implement the read and write of those headers in several places,
lets move those to one place. Additional advantage is that we can now
unittest those headers.

Also in kmail repo we need to use those classes.

Allow to use UNITY build see https://cmake.org/cmake/help/latest/prop_tgt/UNITY_BUILD.html (Reduce compile time. Need cmake 3.16.0)

CCBUG: 421908
(cherry picked from commit e884d21c)

CCBUG: 421908

Summary:
Rather than using a shared library from kdepim-apps-libs, we use DBus to
talk to the agent. This ultimately allows us to kill the dedicated
libKF5SendLater library.

This also moves some pieces of the libKF5SendLater library that are used
in MessageComposer public API into MessageComposer library.

Reviewers: mlaurent

Reviewed By: mlaurent

Subscribers: kde-pim

Tags: #kde_pim

Differential Revision: https://phabricator.kde.org/D29722

Summary:
Use the new Follow-up Reminder agent DBus function to add a new reminder,
rather than using the intermediate library to write into the shared config.

Reviewers: mlaurent

Reviewed By: mlaurent

Subscribers: kde-pim

Tags: #kde_pim

Differential Revision: https://phabricator.kde.org/D29629

We already export all the other jobs, to be consitent we should also
export SignEncryptJob and we need this to be exported to run tests
against this job.

Summary:
Currently protected headers are in draft status for an RFC:
https://datatracker.ietf.org/doc/draft-autocrypt-lamps-protected-headers/

Test Plan: run autotests successfully

Subscribers: kde-pim

Tags: #kde_pim

Differential Revision: https://phabricator.kde.org/D28448

which will be replace by composer info (as CC/FROM/subject etc.)