Adapts QDBusMetaObject to be in sync with the moc/meta-object
changes for property and method descriptors (storing the name and
argument count of methods, and more elaborate type information).
Now that the method name is stored in the standard method
descriptor, QtDBus doesn't need to store it separately anymore,
and the QMetaObjectPrivate::rawStringData() function can be
removed.
Change-Id: I04efdbe05b52bbd85405e1713509e55308ac42da
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>