Flags are not serialized correctly

When connecting a replica to a source, all properties get serialized in the "initialize" IPC package.

This is done by using the serializeProperty function. This contains the following code:

if (property.isEnumType()) {
        ds << QVariant::fromValue<qint32>(value.toInt());
        return;
}

This works fine for enums, but it doesn't for a QFlag, as this always returns 0.

This is only a problem for the initialization as during a update of the property a InvokePacket is send as well and for this the QVariant::serialize() function is used instead which transfers the correct value.