not all qt enums declared with Q_ENUMS

Low prio but would probably be such a tiny fix in qt source and would greatly simplify our code.

The problem is that some of the enums in qt5/qtbase/src/corelib/global/qnamespace.h are not declared with Q_ENUMS.

This means that, for example, they are not exposed to qml. We can, for example, say in qml:

Qt.Key_Backspace
Qt.Key_C

(because there is "Q_ENUMS(Key)" in qnamespace.h), but trying to say

Qt.ShiftModifier

ends up with an error. This means that we basically end up with a number of new enums in our qml, which then can be used e.g. in calls to our c++ functions which ... map them back to qt enum to call qt functions (such as KeyEvent constructor).

Not a huge problem but duplicated enums and the mapping in our code would not be needed if only qt source contained "Q_ENUMS(KeyboardModifier)" (and similar declarations for other enums).