Clean up valist checkers

[DonatNagyE]

What would you use as the name of the single checker?

There is lots of bikeshedding potential in this question and I’m not too satisfied with the security.VaList that I suggested:

• Converting va_list to CamelCase can produce either VaList (probably the least bad option), VAList (which is used in a few variable names within the checker code) or perhaps even Valist or Va_list…
• I’m a bit ashamed that I’m using security as an “everything else” group… is there anything better?

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Also, should I think about preserving the old checker names for the sake of backwards compatibility – or can we say that “these were undocumented[1], so we’re just removing them”?

[1] They presumably appear in the output produced by the “list all checkers” command line flag, but they’re missing from the web docs.