Add animated transition preview support

Jean-Baptiste Mardellerequested to merge
work/transition-preview into master
  • Implement TransitionIconDelegate for displaying animated GIF previews
  • Add "Generate Previews" button to TransitionListWidget toolbar
  • Integrate Python script for generating transition preview GIFs
  • Fix path handling for preview directory using QStandardPaths
  • Add debug output to help diagnose preview loading issues
  • Add option to view luma files in transitions list and allow dropping them in timeline

Replaces !596 (closed)

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