Add cli command to compact ppf

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• Add command group ppf.
• Add subcommand compact
  • Require --ppf option. Takes path to the ppf file to compact.
  • Optional --target_file. Takes the path to the file the ppf is intended for.
  • Optional --gap_size. Fill gaps of at most this number bytes with data from the target file. Default to 9.
• Compacted ppf has the name <original>.compact.ppf.
• If the ppf does not contain ECC/EDC data, the output should not contain any either.