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Fix deprecation warning of qMetaTypeId(T *)

RINEAU Laurent requested to merge lrineau/dtk:fix_deprecation_warnings_qMetaTypeId_with_argument into develop

Since Qt-5.1, the version with an argument is deprecated:

template <typename T>
QT_DEPRECATED inline Q_DECL_CONSTEXPR int qMetaTypeId(T *)
{ return qMetaTypeId<T>(); }

see in <QtCore/qmetatype.h> line 1810 (for Qt-5.13.2).

So use qMetaTypeId<T>() without argument.

Edited by RINEAU Laurent

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