D25955: Port away from global IconSize() method

[Volker Krause]

vkrause added a task: T11637: Investigate if KIconThemes is needed as a framework.

REPOSITORY
  R208 KNotes

REVISION DETAIL
  https://phabricator.kde.org/D25955

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