Allow for more natural mocks

Currently, void functions must be mocked like this: QMOCK(qint32, bar, (void), (const)); it would be nice if it could be written like this: QMOCK(qint32, bar, () (const));

Currently, functions that differ only in argument or specifier number counts must be mocked like this: QMOCK(qint32&, bar, (void), (,)); it would be nice if it could be written like this: QMOCK(qint32&, bar, (void), ());