request: add const member function flag for C++

Hi all,

I'd like to bring to your attention one feature that's missing from C++ parser.
This is the example source file:

#+begin_src C++
class ABC
{
    int value() const;
};
#+end_src

`bovinate' returns:

    (("ABC" type
            (:members
             (("value" function
                       (:prototype-flag t :type "int")
                       (reparse-symbol classsubparts)
                       #<overlay from 17 to 35 in test.cc>))
             :type "class")
            nil #<overlay from 1 to 38 in test.cc>))

while I'd like it to return:

    (("ABC" type
            (:members
             (("value" function
                       (:prototype-flag t :constant-flag t :type "int")
                       (reparse-symbol classsubparts)
                       #<overlay from 17 to 35 in test.cc>))
             :type "class")
            nil #<overlay from 1 to 38 in test.cc>))

The difference is ":constant-flag t". The constant-flag is already implemented
for variables, but not yet for member functions.

best regards,
Oleh

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