FFmpeg Batch AV Converter: download ældre versioner

� Tested with ffmpeg.exe 8.1.1
� Added basic support for bluray protocol (Drag and drop drive, or Main File and context menu). (Input chapters not natively supported by ffmpeg).
� Browser cookies selector used by Get YouTube streams button, to enable Premium streams selection.
� Quick startup enabled by default, due to memory usage (some controls may display different, disable it to get back to default style).

• Tested ffmpeg 8.0.
• Fixed try button -> Copy to clipboard rare runtime error.
• Added warning of missing deno.exe (JavaScript interpreter) soon required to download YouTube videos with yt-dlp.
• Minor translation fix, youtube links time format fixed, yuv420p restored at images to video wizard.

• Polish translation available (a few translations were automatic).
• Log refreshable during encoding, now with encoding results summary.
• Log saved every 60 seconds kept in case of application crash/blackout.
• Added warning for incompatible characters [',] found in input file path, required to be renamed to avoid errors when using ffmpeg filters.
• Fixed: Sequential encoding abruptly ends with some ffmpeg.exe builds.
• Fixed: some settings being lost after upgrades, like ffmpeg.exe path. (installer version).
• Fixed: %fn variable not working (working directory was not set properly).
• Fixed: %f2 variable not working (Windows paths conversion issue).
• Fixed: Keep source timestamp was not applied for some features (two pass encoding, multiplex, batch subtitling).
• Fixed: -vf filter previously not supported in batch subtitles parameters (Burnt subtitles) .
• Fixed: Try preset button sometimes rendering application unresponsive.
• Hopefully fixed Youtube download progress sometimes wrong by a factor of 10.
• Other minor corrections and bugfixes.