libppd 2.0.0

[tillkamppeter]

Final 2.0.0 release with a security vulnerability fix and some other last fixes

• ppd_scan_ps(): Fix CVE-2023-4504
  Added check for end of buffer/string when reading escaped character after backslash, return NULL (invalid string) if no character follows.
• Promoted the static function "ppd_decode()" of ppd/ppd.c into the API function "ppdDecode()".
• ppdEmitJCLPDF(): Decode "JCLToPDFInterpreter" value in ppdEmitJCLPDF()
  Fixes "classic" (non-driverless) PDF printing (Issue PPD option JCLToPDFInterpreter's value is not decoded, breaks printing for PDF+PJL PPDs #24).
• ppdLoadAttributes(): Apply cfIEEE1284NormalizeMakeModel() to NickName
  Make and model for the printer IPP attributes are extracted from the PPD's NickName, which sometimes misses the manufacturer's name. Extract it from the PPD's Manufacturer field or derive it from the model name if possible. Enhanced alternative for pull request ppd/ppd-ipp.c: Use make when constructing printer-make-model attr #21.
• Makefile.am: Fix disabling testppdfile
  Missing conditionals made the binary built when disabled (Pull request Makefile.am: Fix disabling testppdfile #18).

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This discussion was created from the release libppd 2.0.0.