Improve warning control API (with backwards compatibility)

A wart of the warning control API (enable/disable_*_warnings()) is that
the current warning settings can't be queried. Querying warning settings
is useful in functions that want to temporarily enable/disable some
warning and then put things back to how they were.
kconfiglib.load_allconfig() ran into this, for example.

Make the internal warning control variables public (improve the naming
at the same time), and encourage just setting them directly. Keep the
old API for backwards compatibility.

Also remove _warn_redun_assign() and _warn_override(). They're trivial
and were called in a single place.

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