Fixed issue: #968

[RomaPrograms]

Added checking last bytes in cross-reference table entry.
In documentation says that at the end of the lines of cross-reference table can be only CRLF or spaceCR or spaceLF.
Passed integration tests.
Closes veraPDF/veraPDF-library#968.

[codecov]

Codecov Report

Merging #399 into integration will increase coverage by 0.01%.
The diff coverage is n/a.

@@                Coverage Diff                @@
##             integration     #399      +/-   ##
=================================================
+ Coverage          25.19%   25.20%   +0.01%     
- Complexity           874      875       +1     
=================================================
  Files                232      232              
  Lines              12806    12819      +13     
  Branches            1834     1838       +4     
=================================================
+ Hits                3226     3231       +5     
- Misses              9200     9206       +6     
- Partials             380      382       +2     

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