Move EnumVisitor TraverseType code to TraverseDecl function and test

[spfennell]

Before llvm+clang 14, EnumVisitor TraverseDecl also traversed the type. LLVM + Clang determined this to be a bug, so now we also call TraverseType in TranslationUnitVisitor.cpp and ClassVisitor.cpp

evis.TraverseDecl(ed) ;
#if (LIBCLANG_MAJOR >= 14)
evis.TraverseType(clang::QualType(ed->getTypeForDecl(), 0));
#endif

We can move the EnumVisitor::VisitEnumType code to VisitEnumDecl, but I don't want to do this without adding more tests to make sure all the enum edge cases work. There might be some callback function called when traversing a type that gets missed when only visiting enumDecl (maybe for const enums, anonymous enums, or some other edge case).

[spfennell]

This issue can be closed when the code is moved and tested as described above