Fixed coexistence between Qt Raw plugin and KDcraw (CCBUG: 463132)

Mirco Miranda requested to merge mircomir/gwenview:fix_for_qt_raw_plugin into master

Use the RAW plugin to load raw images if installed.

  • Previews are always generated from the RAW image at the fastest possible speed.
  • Images are loaded in the highest possible quality (default plugin raw).
  • If the raw plugin is not installed everything works as before (use KDcraw).
  • Fix CCBUG: 463132

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