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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)

GIT_SILENT: Prepare 5.14.0 beta1. Update ecm as 5.67.0 is broken see 417396. 5.68 will be release in 2 days. But dependancy freeze is tomorrow.

Summary:
This massively reduces the amount of network requests, at very little
disk and memory cost (1Mb per 20+k of missing avatars with both backends,
60+k for just Gravatar).

It's even more important when having both backends enabled, in that case
we always did a request for the first backend even if the second one could
provide it from the local cache.

Reviewers: #kde_pim, mlaurent

Reviewed By: #kde_pim, mlaurent

Subscribers: mlaurent

Tags: #kde_pim

Differential Revision: https://phabricator.kde.org/D7438

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
techbase wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://community.kde.org/Frameworks/GitOldHistory

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, kdepim master branch, at commit
d0009536f24e8c7f4cc32a70936f5c25194e9a6f