D20970: Clean up Handler factory API

[Volker Krause]

vkrause accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R165 Akonadi

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20970

To: dvratil, vkrause
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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