Add a slide on member function pointers

[bernhardmgruber]

AFAIK, we don't discuss member function pointers (e.g. int (S::*)(float) would be the pointer type of f in struct S{ int f(float); };) and operator.*/operator->* anywhere.

Member pointers are not only super cryptic, they also make good candidates for C++ quizzes (fun!) :)

[stale]

This issue or pull request has been automatically marked as stale because it has not had recent activity. Please manually close it, if it is no longer relevant, or ask for help or support to help getting it unstuck. Let me bring this to the attention of @klieret @wdconinc @michmx for now.