* fixes for the wrong usage of K/QIcon vs. pixmap (from incomplete Qt3->Qt4 porting):
  Q/KIcon does not have a real size, it's more kind of a factory for whatever
  pixmap size it is asked for, so just loading a certain icon pixmap and setting that
  to a KIcon/QIcon is useless, as the widget which takes the icon might request a
  different size. So e.g. passing a SmallIcon("icon-foo") to a button which takes a
  QIcon can result in badly scaled icons instead of loading the most perfect size
  match from the icon-set.
* removes lots of unneeded includes, usually kiconloader.h
* makes the API consistent for some classes, with
 "iconName" for a QString-based icon name and
 "icon" for a KIcon/QIcon type property
* use consistently "IconSize" everywhere instead of "KIconLoader::global()->currentSize"
* removes unused "KPrFactory::iconLoader()"
* adds a simple script tools/iconcheck/iconcheck.py to find iconnames without existing icons

REVIEW: 105289