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support styles for log formatters

- pull in python3 style implementations; extend with '$' variant using
  safe_substitute instead of substitute

- add default python2 formatter that provides style support

- push validation of format string into handler (formatter)
  construction, since validation can no longer be performed only on the
  basis of the format value

- deal with 3rd-party formatter factories by clobbering the
  formatMessage and usesTime methods based on the selected style when
  not "classic"; for python2 we also take over the format method, else
  our formatMessage would not be used

- refactor: move formatter validation & construction to new
  ZConfig.components.logger.formatter module

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