D25553: Port away from deprecated Bar|Desktop|SmallIcon methods

[Volker Krause]

vkrause added a task: T11654: Deprecate SmallIcon/DesktopIcon/BarIcon/UserIcon/MainBarIcon and KDE::icon in favor of KIconLoader or QIcon API.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D25553

To: vkrause
Cc: okular-devel, johnzh, andisa, siddharthmanthan, maguirre, fbampaloukas, joaonetto, kezik, tfella, ngraham, darcyshen, aacid
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