PEL: PHP Exif Library, bundled with AccessNow Image Optimizer

Source:  https://github.com/pel/pel (Packagist: lsolesen/pel), commit fbbb5905646f86b226355c8fcc99e0745a2f5e52
Licence: GNU General Public License, version 2 or (at your option) any later version.
         See COPYING. Authors: see AUTHORS.

Used to edit the EXIF block of JPEG files (remove the GPS location, add to the description)
without re-encoding them. Generated by `composer prefix-pel` (Strauss): do not edit by hand.

Changes from the original:
- The namespace lsolesen\pel is renamed AccessNow\ImageOptimizer\Vendor\Pel, so this copy can
  never clash with another plugin that bundles PEL.
- PelCanonMakerNotes::parsePictureInfo(): a leftover debug printf("Current Tag: ...") is removed
  (it printed into the page whenever a Canon photo's maker notes were read).
- PelTag/PelIfd: the EXIF 2.3-2.32 tags PEL is missing (lens make, model and specification,
  body and lens serial numbers, camera owner, ISO sensitivity, composite image, environment,
  GPSHPositioningError) are added, and PelIfd::$keepUnknownTags (off by default) lets the main
  directories keep any other tag, so a rebuilt EXIF block no longer drops them.
