refs #314, fromQVariant / location of toQVariant

* renamed fromQVariant to convertFromQVariant, the "from" methods imply the object is changed (fromJson, fromString ..)
* implemented fromQVariant - changing the object by QVariant
* moved toQVariant into PQ template
* free function setFromQVariant

src/blackmisc/mathmatrixbase.h

@@ -8,8 +8,8 @@
 
 #include "blackmisc/valueobject.h"
 #include "blackmisc/mathvector3dbase.h"
+#include "blackmisc/blackmiscfreefunctions.h"
 #include <QGenericMatrix>
-#include <QDBusMetaType>
 
 namespace BlackMisc
 {
@@ -87,6 +87,12 @@ namespace BlackMisc
             //! \copydoc CValueObject::getValueHash
             virtual uint getValueHash() const override;
 
+            //! \copydoc CValueObject::toQVariant()
+            virtual QVariant toQVariant() const override { return QVariant::fromValue(*derived()); }
+
+            //! \copydoc CValueObject::fromQVariant
+            virtual void fromQVariant(const QVariant &variant) override { BlackMisc::setFromQVariant<ImplMatrix>(derived(), variant); }
+
             //! \brief Equal operator ==
             bool operator ==(const ImplMatrix &other) const
             {