QCTools 4+

=== Thanks to New York Public Library and Smithsonian National Museum of African American History and Culture (NMAAHC) for their support and contributions on this release ===
+ Refactor of method to generate statistics, panels, and thumbnails based on QtAVPlayer.
+ Updates to several playback filters to support RGB based pixel formats.
+ Additional Value Highlight playback filter to show specific values in addition to ranges.
+ Options to show Action Safe and Title Safe boundaries, thx @bbgdzxng1.
+ Improvements to several filters including Broadcast Illegal Focus, Bit Plane, and Waveform Target.
+ Replacement of the Chroma Delay playback filter with one based upon FFmpeg's chromashift.
+ Added support with Pixel Scope playback filter with smaller videos.
x Fix typo that broke part of the Extract Planes Equalized playback filter.
x Improvements on reading files that contain non-audiovisual streams.
+ Readnig panels from qctools.mkv report.
+ The Datascope, Waveform Target, Vectorscope Target, Zoom, and Pixel Scope filters now use a resizable/movable selection box to determine their area of focus.
+ Adding a blockdetect and blurdetect graph.
+ Switching to QtAVPlayer for graphing and playback, which also adds ffmpeg5 support to QCTools
x Fix issue with saving reports with comments (#738).
+ Added tests for valid files.
+ Performance improvements in player via QtAVPlayer.
x Fixes to audio statistics timestamps (#778).
x Fixes for loading/saving panels.
x Fixes to playback via the graph view.
x Fix critical bug where QCTools would use context from the thumbnail track of the QCTools report, if present, rather than the context of the source file.