scrubcsv 1.0.0

Added

• Official 1.0.0 release, because this program has been used in production for
  years.
• --clean-column-names=stable provides a new column-name-cleaning algorithm.
  This converts ASCII characters to lowercase, converts spaces to _, and
  verifies that the resulting column name is a unique, valid C identifier. The
  goal of this new column name cleaner is to make our output column names
  easily predictable.
• --reserve-column-names=REGEX will cause scrubcsv to fail if it would
  generate output columns matching REGEX.
• Binary builds for more platforms, including M1.