D7666: Remove the now unused Sieve syntax highlighter

[Laurent Montel]

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

REPOSITORY
  R95 PIM: Common Support

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7666

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