I swore I would not make a new release this year, but some are evidently failing to bind to pngquant/libimagequant. Let's fix this!

Front-end

• Add a new image quantizer: HexTree.

• Update the GUI layout and tooltips.

• Reorganized the Image quantizer option for the CLI (and GUI):

  --qmode (-q)	Quantizer	Speed	Quality	Compressibility
  0	K-Means	Slow	High	Low
  1	Pillow	Turbo	Low	Very high
  2	HexTree[fallback]	Very fast	Good	Medium-Low
  3	libimagequant/pngquant[default]	Fast	Best	Medium-Low

  By default, SUPer attempts to use-q 3: libimagequant/pngquant (LIQ). If it fails to find either, it will fallback to HexTree.

  • LIQ reigns supreme to quantize gradients and glows. HexTree may struggle occasionally on those but remains a good alternative.
  • Pillow is excellent for low bitrate, and can do wonders with colour effects like fades and karaoke at very low bandwidths.
  • K-Means is solely for users who fail to bind SUPer to libimagequant/pngquant but still wishes to produce high quality encodes.

• Warn user if the BDN contains PNG that are already palettized or events split across two graphics.

• Add--capabilities to the CLI to display the available implementations (optimizations) of the Brule libraries.

• [Windows builds] Update the libimagequant DLL to v4.0.3.

Back-end

• Improve significantly the speed of K-Means image quantizer.
• Make palette update buffering logic more robust with HFR content.
• Fix infrequent palette corruption after a Normal Case object redefinition.
• Fix window coordinates of large overlays that were split in two pieces to fit in the coded data buffer.
• Sanitize timecode handling and BDN parser. DF 29.97 & DF 59.94 should now be supported. (NDF were already!)
• Clean-up the code and optimize a few components.
• Fix config.ini look-up in frozen executables.

Virtual environment users shall do a clean install. HexTree will be subpar if your system fails to compile the C extension.