Move the themedIcon code out of KoIcon.h
It's now in widgets/KoIconUtils so everyone can make use of themed icons. KoToolBoxButton used that now to get themed toolbox icons. In Krita, KisIconUtils now is part of KisGlobal, and all places where krita loads an icon, now uses KisIconUtils::loadIcon, which uses KoIconUtils::themedIcon.
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