partial implementation of a clang-check for missing namespace std::

I have a clang check for missing namespace ‘std’ on fields and variables nearly working.

I can’t see how to match fieldDecl and varDecl at the same time and I can’t see how to match pointers or references to types missing namespace std::

What’s the best way to get feedback/input on what I’ve done so far? Code does not work well enough for a review to seem appropriate.