Add missing error log context parameter.
Fixed Qt4/5 MOC issues regarding QIconEngineV2.
Fixed incompatibilities between Windows.h and Qt 5 (NOMINMAX).
Add NOMINMAX definition to global compile flags.
Change sleep duration from 200ms to 250ms.
Set QT_INSTALLED_LIBRARY_DIR in case of Qt5.
Merge pull request #505 from kislinsk/504-qt5-fixes

Make CTK compatible with Qt5 again.