Add Q_ENUMS to QStyle's enumerations.

This makes it significantly easier to obtain debug output
for style functionality.

Task-number: QTBUG-38858
Change-Id: I19edc834a55fa369b6830abeb4697ae5e5ded995
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

src/widgets/styles/qstyle.h

@@ -66,6 +66,9 @@ class Q_WIDGETS_EXPORT QStyle : public QObject
 {
     Q_OBJECT
     Q_DECLARE_PRIVATE(QStyle)
+    Q_ENUMS(StateFlag PrimitiveElement ControlElement SubElement ComplexControl)
+    Q_ENUMS(SubControl PixelMetric ContentsType RequestSoftwareInputPanel StyleHint)
+    Q_ENUMS(StandardPixmap)
 
 protected:
     QStyle(QStylePrivate &dd);