TODO Items
-----------------------------------------------------------------

version 1.0.0: (planned TBD)
FOCUS: remaining gaps, testing, documentation
  o testsuite: Generate metrics in reproducible format to enable historical tracking
  o testsuite: Investigate option of embedding decoded text into PNG test image comments
  o testsuite: Tests should compare scanned results to embedded PNG comments
  o testsuite: 'make test' writes metrics file
  o testsuite: 'make test' confirms performance

version 0.9.0: (planned TBD)
FOCUS: refactor encoding engine, FNC1, macros
  o libdmtx:   Implement --auto-fast option using algorithm from spec (lighter & faster?)
  o libdmtx:   Structured append reading and writing
  o libdmtx:   Use new Edifact decode function that doesn't assume full triplet
  o libdmtx:   Check ProcessEndOfSymbolTriplet() for same problem fixed in Edifact
  o libdmtx:   Rewrite encoder(s) to not need "twothirdsbits" tracking (fixes multiple bugs)
  o dmtxread:  Print character values (not just codewords) from --codewords (-c) option
  o dmtxread:  Print out image representing "unstretched" barcode
  o dmtxread:  Print color weights based on direction
  o dmtxread:  Diagnostic image shows tighter-fitting outline
  o dmtxread:  Change dmtxread to print out dump of both failed and successful barcodes if requested
  o dmtxread:  Change dmtxread to print out mis-read modules somehow ... additive, subtractive?
               - Build color vector that describes jump from background to foreground color
               - When module is determined to be "off" then add half of color vector
               - When module is determined to be "on" then subtract half of color vector
               - 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