fftools/ffmpeg: convert to a threaded architecture

Change the main loop and every component (demuxers, decoders, filters, encoders, muxers) to use the previously added transcode scheduler. Every instance of every such component was already running in a separate thread, but now they can actually run in parallel. Changes the results of ffmpeg-fix_sub_duration_heartbeat - tested by JEEB to be more correct and deterministic.
FFmpeg · Dec 12, 2023 · d119ae2 · d119ae2
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commit d119ae2
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diff --git a/Changelog b/Changelog
@@ -7,6 +7,8 @@ version <next>:
 - EVC encoding using external library libxeve
 - QOA decoder and demuxer
 - aap filter
+- demuxing, decoding, filtering, encoding, and muxing in the
+  ffmpeg CLI now all run in parallel
 
 version 6.1:
 - libaribcaption decoder