Discovery callbacks for functions and methods. #3140
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This extends the existing discovery callback mechanism to report on functions and methods. At this stage, we don't say much about them, in order to be consistent with other discovery callbacks. Subsequent PRs will add extra callbacks to provide information especially about methods (virtualness, C++ visibility, etc.) Please request changes if you think that sort of information should arrive in these callbacks.
Because methods are a fundamentally C++ thing, this splits the current ParseCallbacks test to cover both a .h and a .hpp header.
Part of google/autocxx#124