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iterate_words: light-weight equivalent to brk_string,
which does not need to copy the string, and does not do \ interpretation
which are only needed for the string.
escape_dup: handles escape sequence in a systematic way.
This speeds up variable modifiers.
This also makes .for loops more consistent, as they use the same definition
of `a word' as the rest of make.
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- simplify Var_Parse: use varfind, then leverage on the result
to recognize `special case' dynamic parsing.
VarModifiers_Apply need to be called on NULL strings, to be able to parse
modifiers applied to non-existent variables.
(Alternately, we could call VarModifiers_Apply on a dummy string, but
this is less efficient).
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This does finally make var handling somewhat readable.
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