D8128: Change external renderer API to use HtmlWriter

[Sandro Knauß]

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

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  R94 PIM: Message Library

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REVISION DETAIL
  https://phabricator.kde.org/D8128

To: vkrause, knauss
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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