Support Apple Multi-Picture Format JPEG

[Kris-LIBIS]

Make the readAPP0 parsing abide by the length field.

fixes #1051

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.15%. Comparing base (02b4257) to head (c726417).
Report is 45 commits behind head on integration.

Additional details and impacted files

@@              Coverage Diff               @@
##             integration    #1052   +/-   ##
==============================================
  Coverage          47.15%   47.15%           
  Complexity          1102     1102           
==============================================
  Files                 58       58           
  Lines               8993     8993           
  Branches            1618     1618           
==============================================
  Hits                4241     4241           
  Misses              4224     4224           
  Partials             528      528           

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[carlwilson]

Thanks @Kris-LIBIS for this and the corresponding bug report. I've added these to the v1.36 backlog and they will be tested and merged closer to that release.