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It will avoid duplicate code in zanshin for example
It will allow to create addons for kmail as for example we can create some plugins
and I will add more plugin support in the future

QGpgme is using the pthread flavor on Unix, kdepim was using the vanilla
one, resulting in both ending up in the final program. Both have the same
symbol names, so behavior is ... interesting.

This fixes the test_verify unit test failure at least.

Basically all PIM applications moved from foo.desktop to org.kde.foo.desktop in 15.08,
which breaks Kickoff after updating. This adds kconf_update script for each application
to sed-replace the old .desktop name with the new one.