Drop some compatibility and tighten up lexing

Old versions of the C tools used to ignore unhandled characters in some
contexts due to sloppy lexing, which Kconfiglib emulated for
compatibility (things like "---help---" used to depend on it).

This was improved in the C tools by commit c2264564 ("kconfig: warn of
unhandled characters in Kconfig commands"), committed in July 2015.

Remove the compatibility hack and tighten up the lexing in Kconfiglib as
well. It will make implementing the new preprocessor stuff smoother.

The major version will be bumped.

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