D24136: Deprecate the global [Small|Desktop|Bar]Icon() 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
  R302 KIconThemes

REVISION DETAIL
  https://phabricator.kde.org/D24136

To: vkrause, dfaure
Cc: dfaure, ngraham, kde-frameworks-devel, LeGast00n, GB_2, michaelh, bruns