D23811: [KImageFormats] Port HDR (Radiance RGBE) image loader to Qt5

[Christoph Feck]

cfeck created this revision.
cfeck added a reviewer: Frameworks.
cfeck added a project: Gwenview.
Herald added a project: Frameworks.
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cfeck requested review of this revision.

TEST PLAN
  Tested with HDR images from hdrihaven.com
  
  - Loading in KolourPaint works
  - Thumbnails in Dolphin work

REPOSITORY
  R287 KImageFormats

REVISION DETAIL
  https://phabricator.kde.org/D23811

AFFECTED FILES
  src/imageformats/CMakeLists.txt
  src/imageformats/hdr.cpp
  src/imageformats/hdr.json
  src/imageformats/hdr_p.h

To: cfeck, #frameworks
Cc: kde-frameworks-devel, LeGast00n, tommo, GB_2, clintmoyer, tdarboux, huoni, michaelh, muhlenpfordt, rkflx, ngraham, bruns
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