D29539: Port to ThumbnailCreatorV3 to support devicePixelRatio

[Méven Car]

meven created this revision.
meven added reviewers: Frameworks, ngraham, broulik, elvisangelaccio.
meven requested review of this revision.

REVISION SUMMARY
  Generate a thumbnail depending of devicePixelRatio.
  
  Depends on kio D29397 <https://phabricator.kde.org/D29397>
  And kio-extras D29526 <https://phabricator.kde.org/D29526>

TEST PLAN
  Manually tested

REPOSITORY
  R343 FFmpeg Thumbnailers

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D29539

AFFECTED FILES
  ffmpegthumbnailer.cpp
  ffmpegthumbnailer.h

To: meven, #frameworks, ngraham, broulik, elvisangelaccio
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