Alpha v9.4.1

This patch includes various fixes and improvements.

Added

• Warn user if FFmpeg is not installed by @seakrueger in #441
• Support for .raf and .orf raw image thumbnails and previews by @CyanVoxel in 5995e4d and 4d405b5

Fixed

• Use birthtime for file creation time on Mac & Windows by @seakrueger in #472
• Use audio icon fallback when FFmpeg is not detected by @seakrueger in #471
• Retain search query upon directory refresh by @seakrueger in #483

Changed

• Significantly improve file re-scanning performance by @CyanVoxel in #486

Full Changelog: v9.4.0...v9.4.1